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Ran 14 Feb 2026 02:53PM UTC

Files 349

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Committed 14 Feb 2026 04:38AM UTC coverage: 75.447% (+4.1%) from 71.314%

Job # 1442

Build Type

push

buildkite

Committed by

web-flow

Commit Message

[JuliaLowering] Fix-up implementation of `GC.@preserve` (#61022)

Trying to emulate the scope token by introducing an identifier / local
doesn't work when the result is compiled:
```julia
julia> JuliaLowering.include_string(Main, raw"""
       foo() = let
           debug_buffer = IOBuffer()
           GC.@preserve debug_buffer try; println(); catch; end
       end
       foo()
       """; expr_compat_mode=true)
julia: /home/topolarity/repos/julia/src/codegen.cpp:6999: jl_cgval_t emit_expr(jl_codectx_t&, jl_value_t*, ssize_t):
Assertion `token.V->getType()->isTokenTy()' failed.
```

As far as I can tell, this must be implemented via `Expr(:gc_preserve,
...)` since the `gc_preserve_begin` token must end up ultimately as an
`SSAValue`.

Resolves https://github.com/JuliaLang/JuliaLowering.jl/issues/145.

P.S. @mlechu this is fairly barebones test coverage, so let me know if
you'd like me to add some more.

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61897 of 82040 relevant lines covered (75.45%)

8314282.48 hits per line

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