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Parallelize AST -> HIR lowering - #163495

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@aerooneqq aerooneqq commented Sep 29, 2026 •

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Draft for perf and CI.

r? @petrochenkov

@rustbot 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 Sep 29, 2026
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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 29, 2026
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rust-bors Bot pushed a commit that referenced this pull request Sep 29, 2026
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☀️ Try build successful (CI)
Build commit: 79a91eb (79a91eb0736d9f47b5af3d4282e49ada6baa01ca)
Base parent: ea6bb45 (ea6bb45b74c24a026dab4187b1550e97b6985c8a)

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Finished benchmarking commit (79a91eb): comparison URL.

Overall result: ❌ regressions - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)
0.9% [0.2%, 9.2%] 88
Regressions ❌
(secondary)
1.3% [0.1%, 7.4%] 172
Improvements ✅
(primary)
-0.2% [-0.2%, -0.2%] 1
Improvements ✅
(secondary)
-0.2% [-0.2%, -0.2%] 1
All ❌✅ (primary) 0.9% [-0.2%, 9.2%] 89

Max RSS (memory usage)

Results (primary 1.2%, secondary 0.4%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
1.8% [1.1%, 2.8%] 4
Regressions ❌
(secondary)
3.3% [1.7%, 7.2%] 10
Improvements ✅
(primary)
-0.9% [-0.9%, -0.9%] 1
Improvements ✅
(secondary)
-4.5% [-5.9%, -2.7%] 6
All ❌✅ (primary) 1.2% [-0.9%, 2.8%] 5

Cycles

Results (primary 11.0%, secondary 2.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
11.0% [2.2%, 28.4%] 13
Regressions ❌
(secondary)
4.8% [2.2%, 9.7%] 3
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-3.5% [-3.5%, -3.5%] 1
All ❌✅ (primary) 11.0% [2.2%, 28.4%] 13

Binary size

Results (primary -0.1%, secondary -0.3%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
0.2% [0.2%, 0.2%] 4
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.3% [-0.3%, -0.3%] 4
Improvements ✅
(secondary)
-0.3% [-0.3%, -0.3%] 4
All ❌✅ (primary) -0.1% [-0.3%, 0.2%] 8

Bootstrap: 489.575s -> 491.192s (0.33%)
Artifact size: 406.37 MiB -> 407.23 MiB (0.21%)

@rustbot rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Sep 29, 2026
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Kobzol commented Sep 30, 2026

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Pretty nice results!

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aerooneqq commented Sep 30, 2026 •

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Parallelization of AST -> HIR lowering broke deterministic encoding of syntax contexts 🤣 (#161450).
UPD: not that sure about that, maybe some other parts of metadata causing it, will research it.

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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 30, 2026
rust-bors Bot pushed a commit that referenced this pull request Sep 30, 2026
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☀️ Try build successful (CI)
Build commit: 335f660 (335f660f9c0a0a3b69b6e32858af6d7f3af36c51)
Base parent: 7d2cd0f (7d2cd0fbc092625ea371da704f15f80216d2220e)

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Finished benchmarking commit (335f660): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)
0.7% [0.2%, 1.1%] 9
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.7% [-0.8%, -0.7%] 2
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.4% [-0.8%, 1.1%] 11

Max RSS (memory usage)

Results (primary -3.1%, secondary -2.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
1.8% [1.8%, 1.8%] 1
Regressions ❌
(secondary)
2.1% [2.0%, 2.2%] 2
Improvements ✅
(primary)
-3.1% [-7.8%, -1.2%] 118
Improvements ✅
(secondary)
-3.1% [-5.2%, -1.4%] 23
All ❌✅ (primary) -3.1% [-7.8%, 1.8%] 119

Cycles

Results (primary 14.6%, secondary -2.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
14.6% [4.4%, 27.7%] 9
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-2.7% [-3.0%, -2.5%] 3
All ❌✅ (primary) 14.6% [4.4%, 27.7%] 9

Binary size

Results (primary -0.0%, secondary -0.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
-0.0% [-0.1%, -0.0%] 9
Improvements ✅
(secondary)
-0.1% [-0.1%, -0.1%] 5
All ❌✅ (primary) -0.0% [-0.1%, -0.0%] 9

Bootstrap: 489.84s -> 488.516s (-0.27%)
Artifact size: 406.54 MiB -> 406.46 MiB (-0.02%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 30, 2026
@oli-obk oli-obk self-assigned this Oct 2, 2026
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Oct 7, 2026
…joshtriplett

Remove `NonOwner` variant from `AstOwner`

The refactoring extracted from rust-lang#163495 that should be responsible for memory improvements. And seems logical that enum `AstOwner` should not contain variant `NonOwner`.

r? @petrochenkov
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Oct 7, 2026
…joshtriplett

Remove `NonOwner` variant from `AstOwner`

The refactoring extracted from rust-lang#163495 that should be responsible for memory improvements. And seems logical that enum `AstOwner` should not contain variant `NonOwner`.

r? @petrochenkov
JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Oct 7, 2026
…joshtriplett

Remove `NonOwner` variant from `AstOwner`

The refactoring extracted from rust-lang#163495 that should be responsible for memory improvements. And seems logical that enum `AstOwner` should not contain variant `NonOwner`.

r? @petrochenkov
rust-bors Bot pushed a commit that referenced this pull request Oct 7, 2026
Rollup merge of #163887 - aerooneqq:remove-ast-non-owner, r=joshtriplett

Remove `NonOwner` variant from `AstOwner`

The refactoring extracted from #163495 that should be responsible for memory improvements. And seems logical that enum `AstOwner` should not contain variant `NonOwner`.

r? @petrochenkov
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aerooneqq force-pushed the parallel-ast-hir-lowering branch from bb4a6b3 to 25fca6d Compare October 8, 2026 11:55
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Blocked by #163668, #162809, the combination of these two will fix determinism-related tests.

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The job test-aarch64-gnu-llvm-22-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)
---- [run-make] tests/run-make/parallel-reproducible-build stdout ----

error: rmake recipe failed to complete
status: exit status: 101
command: cd "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/rmake_out" && env -u RUSTFLAGS -u __STD_REMAP_DEBUGINFO_ENABLED AR="ar" BUILD_ROOT="/checkout/obj/build/aarch64-unknown-linux-gnu" CC="cc" CC_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fPIC -w" CXX="c++" CXX_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fPIC -w" HOST_RUSTC_DYLIB_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib" LD_LIBRARY_PATH=":/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" LD_LIB_PATH_ENVVAR="LD_LIBRARY_PATH" LLVM_BIN_DIR="/usr/lib/llvm-22/bin" LLVM_COMPONENTS="aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils abi aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgputargetmca amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo cas cfguard cgdata codegen codegentypes core coroutines coverage debuginfobtf debuginfocodeview debuginfodwarf debuginfodwarflowlevel debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dtlto dwarfcfichecker dwarflinker dwarflinkerclassic dwarflinkerparallel dwp engine executionengine extensions filecheck frontendatomic frontenddirective frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo hipstdpar instcombine instrumentation interfacestub interpreter ipo irprinter irreader jitlink lanai lanaiasmparser lanaicodegen lanaidesc lanaidisassembler lanaiinfo libdriver lineeditor linker loongarch loongarchasmparser loongarchcodegen loongarchdesc loongarchdisassembler loongarchinfo lto m68k m68kasmparser m68kcodegen m68kdesc m68kdisassembler m68kinfo mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess passes perfjitevents plugins powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo riscvtargetmca runtimedyld sandboxir scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo spirv spirvanalysis spirvcodegen spirvdesc spirvinfo support supportlsp symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target targetparser telemetry textapi textapibinaryreader transformutils ve veasmparser vecodegen vectorize vedesc vedisassembler veinfo webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86targetmca xcore xcorecodegen xcoredesc xcoredisassembler xcoreinfo xray xtensa xtensaasmparser xtensacodegen xtensadesc xtensadisassembler xtensainfo" LLVM_FILECHECK="/usr/lib/llvm-22/bin/FileCheck" NODE="/usr/bin/node" PYTHON="/usr/bin/python3" RUSTC="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" RUSTDOC="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustdoc" SOURCE_ROOT="/checkout" TARGET="aarch64-unknown-linux-gnu" TARGET_EXE_DYLIB_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib/rustlib/aarch64-unknown-linux-gnu/lib" __BOOTSTRAP_JOBS="4" __RMAKE_VERBOSE_SUBPROCESS_OUTPUT="1" __RUSTC_DEBUG_ASSERTIONS_ENABLED="1" __STD_DEBUG_ASSERTIONS_ENABLED="1" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/rmake"
stdout: none
--- stderr -------------------------------
LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "static-muts-issue-140413.rs" "-o" "static-muts-issue-140413" "-Zthreads=50" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===



LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "derives-issue-129094.rs" "-o" "derives-issue-129094" "-Zthreads=16" "-Copt-level=3" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===
warning: struct `PackedPoint` is never constructed
---




LD_LIBRARY_PATH="/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory:/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/lib::/checkout/obj/build/aarch64-unknown-linux-gnu/stage0/lib/rustlib/aarch64-unknown-linux-gnu/lib" "/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" "-L" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/run-make/parallel-reproducible-build/temporary-directory" "derives-issue-129094.rs" "-o" "derives-issue-129094" "-Zthreads=16" "-Copt-level=3" "--target=aarch64-unknown-linux-gnu"
output status: `exit status: 0`
=== STDOUT ===



=== STDERR ===
warning: struct `PackedPoint` is never constructed

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