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Illegal Instruction Promoting const panic! #54305

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cramertj opened this issue Sep 17, 2018 · 4 comments
Closed

Illegal Instruction Promoting const panic! #54305

cramertj opened this issue Sep 17, 2018 · 4 comments
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@oli-obk
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A-const-fn Area: const fn foo(..) {..}. Pure functions which can be applied at compile time.

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@cramertj
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#![feature(min_const_fn, const_panic)]

const fn foo() {
    panic!("")
}

fn main() {
    let _: &'static () = &foo();
}

causes an illegal hardware instruction. cc @oli-obk
@cramertj cramertj added the A-const-fn Area: const fn foo(..) {..}. Pure functions which can be applied at compile time. label Sep 17, 2018
@OvermindDL1
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In debug mode, release mode, or both? I've seen this happen in release mode because it's undefined behaviour so an optimization pass kills it.

@matthiaskrgr
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According to the playground it happens for both, release and debug.

@oli-obk
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oli-obk commented Oct 1, 2018

Yea we need to solve this before stabilization. When failing to generate the promoted static we can insert an actual panic.

@oli-obk oli-obk self-assigned this Oct 1, 2018
@oli-obk
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oli-obk commented Oct 26, 2018

This has been circumvented by #53851

@oli-obk oli-obk closed this as completed Oct 26, 2018
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@oli-obk oli-obk

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@oli-obk @OvermindDL1 @matthiaskrgr @cramertj