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Unused move causes a crash #3878

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jruderman opened this issue Oct 27, 2012 · 4 comments
Closed

Unused move causes a crash #3878

jruderman opened this issue Oct 27, 2012 · 4 comments
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A-codegen Area: Code generation E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.
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@jruderman
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fn main()
{
    let y = ~1;
    move y;
}

a.out(43383,0x10065f000) malloc:
*** error for object 0x7ffed14144d0: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

@nikomatsakis
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I think the problem is that, when translating expr_unary_move, if the dest is "ignore", we drop the lvalue but do not zero it.

@vertexclique
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Which fn we use instead of drop_val( lvalue ) in "Ignore" case?

@catamorphism
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This was merged in already, but I also added the test case:

9d276b1

@vertexclique
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@catamorphism I see him there src/test/run-pass/unused-move.rs

RalfJung pushed a commit to RalfJung/rust that referenced this issue Sep 17, 2024
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Labels
A-codegen Area: Code generation E-easy Call for participation: Easy difficulty. Experience needed to fix: Not much. Good first issue. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics.
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