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[ICE] with universal_impl_trait #46469

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leonardo-m opened this issue Dec 3, 2017 · 1 comment
Closed

[ICE] with universal_impl_trait #46469

leonardo-m opened this issue Dec 3, 2017 · 1 comment
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A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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@leonardo-m
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Reduced code:

#![feature(universal_impl_trait, conservative_impl_trait)]
fn bar<'a, 'b>
      (data: impl Iterator<Item=&'a str> + 'b,
      x0: usize, y0: usize,
      spam: &'b [&'b [u8]]) -> impl Iterator<Item=u8> + 'b
where 'a: 'b {
    data.map(move |baz| {
        let (x2, y2) = baz.bytes().fold((x0, y0), |(x, y), c| (x, y));
        spam[y2][x2]
    })
}
fn main() {}

Gives:

error: internal compiler error: src\librustc\ty\subst.rs:424: Region parameter out of range when substituting in region 'b (root type=None) (index=2)

note: rustc 1.24.0-nightly (f9b0897c5 2017-12-02) running on x86_64-pc-windows-gnu

thread 'rustc' panicked at 'Box<Any>', src\librustc_errors\lib.rs:448:8
@TimNN TimNN added A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ labels Dec 5, 2017
@cramertj
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cramertj commented Jan 5, 2018

This works on nightly.

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Labels
A-impl-trait Area: impl Trait. Universally / existentially quantified anonymous types with static dispatch. C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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