mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:30:12 +01:00
Richard Smith
4b679510e7
Add checking that a type only satisfies a constraint if it satisfies all of that constraint's equality and rewrite constraints. Enforce the rule that `=` must be used in impls when specifying associated constant values rather than `==`. Turn off the pre-#2173 single-step equality behavior. This is getting somewhat ahead of the approved design, but it's a one-line change to restore the old behavior. Fix `CARBON_CHECK` to handle top-level `,`s in its argument, such as may happen in template argument lists, as this change introduces such a check.
45 lines
1.1 KiB
Plaintext
45 lines
1.1 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// AUTOUPDATE
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// RUN: %{not} %{explorer-run}
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// RUN: %{not} %{explorer-run-trace}
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package ExplorerTest api;
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interface A {
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let TA:! Type;
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fn FA() -> TA;
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}
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interface B {
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let TB:! Type;
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fn FB() -> TB;
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}
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class C(T:! Type) {
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impl as A & B where .TA = i32 and .TB = i32 {
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fn FA() -> i32 {
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// OK, know that TA is i32 here.
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let v: Self.(A.TA) = 1;
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let w: i32 = v;
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return w;
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}
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fn FB() -> i32 {
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// OK, know that TB is i32 here.
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let v: Self.(B.TB) = 2;
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// Don't know that TA is i32; it could be specialized.
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// TODO: We should not accept this.
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let w: Self.(A.TA) = 3;
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return v + w;
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}
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}
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}
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external impl C(i32) as B where .TB == () {
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fn FB() -> () { return (); }
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// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/assoc_const/fail_multi_impl_scoping.carbon:[[@LINE+1]]: ambiguous implementations of interface B for class C(T = i32)
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}
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fn Main() -> i32 { return C(i32).FB(); }
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