repr(transparent): never consider arrays trivial for the ABI by RalfJung · Pull Request #156114 · rust-lang/rust

RalfJung · 2026-05-03T17:55:24Z

This is a simplified version of #155984 for cratering purposes. It's not meant to be landed as-is (at the very least, tons of tests would have to be adjusted to not involve arrays any more).

RalfJung · 2026-05-03T17:55:48Z

@bors try

repr(transparent): never consider arrays trivial for the ABI

rust-log-analyzer · 2026-05-03T18:31:02Z

The job aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
PR_CI_JOB set; skipping tidy
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
downloading https://static.rust-lang.org/dist/2026-04-14/rustfmt-nightly-aarch64-unknown-linux-gnu.tar.xz
---
---- [ui] tests/ui/abi/compatibility.rs#aarch64 stdout ----

error in revision `aarch64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "aarch64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.aarch64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "aarch64-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.aarch64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#aarch64 stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#aix stdout ----

error in revision `aix`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "aix" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.aix" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "powerpc64-ibm-aix" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.aix/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#arm stdout ----

error in revision `arm`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "arm" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.arm" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "arm-unknown-linux-gnueabi" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.arm/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#arm stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#bpf stdout ----

error in revision `bpf`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "bpf" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.bpf" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "bpfeb-unknown-none" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.bpf/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#i686 stdout ----

error in revision `i686`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "i686" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.i686" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "i686-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.i686/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#host stdout ----

error in revision `host`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--cfg" "host" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.host" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.host/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#loongarch32 stdout ----

error in revision `loongarch32`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "loongarch32" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.loongarch32" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "loongarch32-unknown-none" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.loongarch32/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#loongarch64 stdout ----

error in revision `loongarch64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "loongarch64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.loongarch64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "loongarch64-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.loongarch64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#loongarch64 stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#m68k stdout ----

error in revision `m68k`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "m68k" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.m68k" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "m68k-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.m68k/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#mips stdout ----

error in revision `mips`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "mips" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.mips" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "mips-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.mips/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#mips64 stdout ----

error in revision `mips64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "mips64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.mips64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "mips64-unknown-linux-gnuabi64" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.mips64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#mips64 stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#nvptx64 stdout ----

error in revision `nvptx64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "nvptx64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.nvptx64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "nvptx64-nvidia-cuda" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.nvptx64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#nvptx64 stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#powerpc stdout ----

error in revision `powerpc`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "powerpc" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.powerpc" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "powerpc-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.powerpc/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#powerpc stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#powerpc64 stdout ----

error in revision `powerpc64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "powerpc64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.powerpc64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "powerpc64-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.powerpc64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#riscv stdout ----

error in revision `riscv`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "riscv" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.riscv" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "riscv64gc-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.riscv/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#riscv stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#s390x stdout ----

error in revision `s390x`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "s390x" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.s390x" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "s390x-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.s390x/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#sparc64 stdout ----

error in revision `sparc64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "sparc64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.sparc64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "sparc64-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.sparc64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#sparc stdout ----

error in revision `sparc`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "sparc" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.sparc" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "sparc-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.sparc/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#thumb stdout ----

error in revision `thumb`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "thumb" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.thumb" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "thumbv8m.main-none-eabi" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.thumb/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#wasip1 stdout ----

error in revision `wasip1`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "wasip1" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.wasip1" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "wasm32-wasip1" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.wasip1/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---
---- [ui] tests/ui/abi/compatibility.rs#wasm stdout ----

error in revision `wasm`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "wasm" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.wasm" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "wasm32-unknown-unknown" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.wasm/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#wasm stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#x86-64-win stdout ----

error in revision `x86-64-win`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "x86_64_win" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.x86-64-win" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "x86_64-pc-windows-msvc" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.x86-64-win/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0690`.
------------------------------------------

---- [ui] tests/ui/abi/compatibility.rs#x86-64-win stdout end ----
---- [ui] tests/ui/abi/compatibility.rs#x86-64 stdout ----

error in revision `x86-64`: test compilation failed although it shouldn't!
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/abi/compatibility.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--cfg" "x86_64" "--check-cfg" "cfg(test,FALSE,host,i686,x86_64,x86_64_win,arm,thumb,aarch64,s390x,mips,mips64,sparc,sparc64,powerpc,powerpc64,aix,riscv,loongarch32,loongarch64,wasm,wasip1,bpf,m68k,csky,nvptx64)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.x86-64" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "-Cpanic=abort" "-Cforce-unwind-tables=yes" "--target" "x86_64-unknown-linux-gnu" "--extern" "minicore=/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/abi/compatibility.x86-64/libminicore.rlib"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/abi/compatibility.rs:223:1
   |
LL | struct TransparentWrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                             |
   | |                             this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: aborting due to 1 previous error
---

+ error[E0690]: transparent struct needs at most one non-trivial field, but has 2
+   --> $DIR/homogeneous-aggr-transparent.rs:17:1
+    |
+ LL | struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
+    | ^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
+    | |                  |
+    | |                  this field is generic and hence may have non-zero size
+    | needs at most one non-trivial field, but has 2
+ 
1 error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
2   --> $DIR/homogeneous-aggr-transparent.rs:25:1
3    |

28 LL | pub type Test4 = WrapperUnion<Tuple>;
29    | ^^^^^^^^^^^^^^
---
-   --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:17:1
+ error[E0690]: transparent struct needs at most one non-trivial field, but has 2
+   --> $DIR/homogeneous-aggr-transparent.rs:17:1
+    |
+ LL | struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
+    | ^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
+    | |                  |
+    | |                  this field is generic and hence may have non-zero size
+    | needs at most one non-trivial field, but has 2
+ 
+ error: aborting due to 6 previous errors
---
To only update this specific test, also pass `--test-args layout/homogeneous-aggr-transparent.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/layout/homogeneous-aggr-transparent.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/layout/homogeneous-aggr-transparent" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
error[E0690]: transparent struct needs at most one non-trivial field, but has 2
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:17:1
   |
LL | struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
   | ^^^^^^^^^^^^^^^^^^ -  ------- this field contains an array, which might be relevant for the ABI on some targets
   | |                  |
   | |                  this field is generic and hence may have non-zero size
   | needs at most one non-trivial field, but has 2

error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:25:1
   |
LL | pub type Test0 = Tuple;
   | ^^^^^^^^^^^^^^

error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:29:1
   |
LL | pub type Test1 = Wrapper1<Tuple>;
   | ^^^^^^^^^^^^^^

error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:33:1
   |
LL | pub type Test2 = Wrapper2<Tuple>;
   | ^^^^^^^^^^^^^^

error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:37:1
   |
LL | pub type Test3 = Wrapper3<Tuple>;
   | ^^^^^^^^^^^^^^

error: homogeneous_aggregate: Ok(Homogeneous(Reg { kind: Float, size: Size(4 bytes) }))
##[error]  --> /checkout/tests/ui/layout/homogeneous-aggr-transparent.rs:41:1
   |
LL | pub type Test4 = WrapperUnion<Tuple>;
   | ^^^^^^^^^^^^^^

rust-bors · 2026-05-03T20:04:06Z

☀️ Try build successful (CI)
Build commit: 5f6abd8 (5f6abd89da253a562ad85d235b9342a3ac336c28, parent: 818811b3cd1e0ff0d8ef20d5a4cf0b7c079929bc)

RalfJung · 2026-05-03T20:48:21Z

@craterbot check

craterbot · 2026-05-03T20:48:49Z

👌 Experiment pr-156114 created and queued.
🤖 Automatically detected try build 5f6abd8
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

rust-bors · 2026-05-13T04:25:28Z

☔ The latest upstream changes (presumably #156224) made this pull request unmergeable. Please resolve the merge conflicts.

craterbot · 2026-05-17T10:57:36Z

🚧 Experiment pr-156114 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

craterbot · 2026-05-19T14:26:18Z

🎉 Experiment pr-156114 is completed!
📊 19 regressed and 0 fixed (917042 total)
📊 5318 spurious results on the retry-regressed-list.txt, consider a retry¹ if this is a significant amount.
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-156114/retry-regressed-list.txt ↩

RalfJung added 2 commits April 28, 2026 14:29

make repr_transparent_non_zst_fields a hard error

3dfa7ea

never consider arrays trivial for the ABI

9adbd90

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels May 3, 2026

RalfJung changed the title ~~Array nontrivial~~ never consider arrays trivial for the ABI May 3, 2026

RalfJung changed the title ~~never consider arrays trivial for the ABI~~ repr(transparent): never consider arrays trivial for the ABI May 3, 2026

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rust-bors Bot pushed a commit that referenced this pull request May 3, 2026

Auto merge of #156114 - RalfJung:array-nontrivial, r=<try>

5f6abd8

repr(transparent): never consider arrays trivial for the ABI

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 3, 2026

RalfJung mentioned this pull request May 3, 2026

repr(transparent): don't consider most length-0 arrays trivial #155984

Draft

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels May 19, 2026

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