Auto merge of #25091 - quantheory:trait_associated_const_fixes, r=nikomatsakis

Closes #25046 (by rejecting the code that causes the ICE) and #24946. I haven't been able to deal with the array size or recursion issues yet for associated consts, though my hope was that the change I made for range match patterns might help with array sizes, too.

This PR is pretty much orthogonal to #25065.

src/test/compile-fail/associated-const-type-parameters.rs

@@ -0,0 +1,26 @@
+// 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)]
+
+pub trait Foo {
+    const MIN: i32;
+
+    fn get_min() -> i32 {
+        Self::MIN //~ ERROR E0329
+    }
+}
+
+fn get_min<T: Foo>() -> i32 {
+    T::MIN; //~ ERROR E0329
+    <T as Foo>::MIN //~ ERROR E0329
+}
+
+fn main() {}

src/test/run-pass/associated-const-range-match-patterns.rs

@@ -0,0 +1,35 @@
+// 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,
+    });
+}