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Const generic parameters are allowed in the wrong position (causing ICEs). #68398

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eddyb opened this issue Jan 20, 2020 · 0 comments · Fixed by #68434
Closed

Const generic parameters are allowed in the wrong position (causing ICEs). #68398

eddyb opened this issue Jan 20, 2020 · 0 comments · Fixed by #68434
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@varkor
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A-const-generics Area: const generics (parameters and arguments) C-bug Category: This is a bug. F-const_generics `#![feature(const_generics)]` glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.

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@eddyb
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eddyb commented Jan 20, 2020

Note the Array<N, ()> use, instead of Array<(), N>:

#![feature(const_generics)]

pub type Array<T, const N: usize> = [T; N];

pub fn foo<const N: usize>() -> Array<N, ()> {
    unimplemented!()
}

This currently results in cat_expr Errd and broken MIR ICEs.

cc @varkor @yodaldevoid @oli-obk
@jonas-schievink jonas-schievink added A-const-generics Area: const generics (parameters and arguments) C-bug Category: This is a bug. F-const_generics `#![feature(const_generics)]` I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jan 20, 2020
@varkor varkor mentioned this issue Jan 20, 2020
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@varkor varkor self-assigned this Jan 20, 2020
@rust-lang-glacier-bot rust-lang-glacier-bot added the glacier ICE tracked in rust-lang/glacier. label Jan 21, 2020
@varkor varkor mentioned this issue Jan 21, 2020
Merged
@bors bors closed this as completed in 6d69cab Feb 27, 2020
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@varkor varkor

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A-const-generics Area: const generics (parameters and arguments) C-bug Category: This is a bug. F-const_generics `#![feature(const_generics)]` glacier ICE tracked in rust-lang/glacier. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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@eddyb @jonas-schievink @varkor @rust-lang-glacier-bot