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ICE using a trait-associated const in a range match pattern #24946

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@quantheory

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@quantheory

Failing test case:

// Copyright 2015 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.

#![feature(associated_consts)]

struct Foo;

trait HasNum {
    const NUM: isize;
}
impl HasNum for Foo {
    const NUM: isize = 1;
}

fn main() {
    assert!(match 2 {
        <Foo>::NUM ... 3 => true,
        _ => false,
    });
    assert!(match 0 {
        -1 ... <Foo as HasNum>::NUM => true,
        _ => false,
    });
    assert!(match 1 {
        <Foo as HasNum>::NUM ... <Foo>::NUM => true,
        _ => false,
    });
}

The problem here seems to have a similar or the same cause as that in #24938, namely that select is looking for a Self type in a Substs derived from a node's item_substs, but it is not finding it.

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    I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

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