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https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 20:51:16 +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.
39 lines
852 B
Plaintext
39 lines
852 B
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: %{explorer-run}
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// RUN: %{explorer-run-trace}
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// CHECK:STDOUT: result: 1
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package ExplorerTest api;
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interface Frob {
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let Result:! Type;
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fn F[me: Self]() -> Result;
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}
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fn Use[T:! Frob](x: T) -> T.Result {
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var v: T.Result = x.F();
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return v;
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}
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class AlmostI32 {
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var val: i32;
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impl as ImplicitAs(i32) {
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fn Convert[me: Self]() -> i32 { return me.val; }
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}
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}
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impl i32 as Frob where .Result = AlmostI32 {
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fn F[me: Self]() -> AlmostI32 { return {.val = me}; }
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}
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fn Main() -> i32 {
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// Ensure that lookup for
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// i32.(Frob.Result) as ImplicitAs(i32)
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// finds `impl AlmostI32 as ImplicitAs(i32)`.
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return Use(1);
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}
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