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normalize fn sig as part of reification
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// Copyright 2016 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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// This code was creating an ICE in the MIR type checker. The reason | ||
// is that we are reifying a reference to a function (`foo::<'x>`), | ||
// which involves extracting its signature, but we were not | ||
// normalizing the signature afterwards. As a result, we sometimes got | ||
// errors around the `<u32 as Foo<'x>>::Value`, which can be | ||
// normalized to `f64`. | ||
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#![allow(dead_code)] | ||
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trait Foo<'x> { | ||
type Value; | ||
} | ||
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impl<'x> Foo<'x> for u32 { | ||
type Value = f64; | ||
} | ||
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struct Providers<'x> { | ||
foo: for<'y> fn(x: &'x u32, y: &'y u32) -> <u32 as Foo<'x>>::Value, | ||
} | ||
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fn foo<'y, 'x: 'x>(x: &'x u32, y: &'y u32) -> <u32 as Foo<'x>>::Value { | ||
*x as f64 | ||
} | ||
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fn main() { | ||
Providers { foo }; | ||
} |