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https://github.com/carbon-language/carbon-lang.git
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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.
35 lines
872 B
Plaintext
35 lines
872 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: %{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 T:! Type;
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}
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fn F1[T:! A where .T == i32](x: T.T) -> i32 {
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// OK: one equality.
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return x;
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}
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fn F2[U:! A where .T == i32](x: i32) -> U.T {
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// OK: one equality.
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return x;
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}
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fn F3[T:! A where .T == i32, U:! A where .T == i32](x: T.T) -> U.T {
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// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/assoc_const/fail_indirectly_equal.carbon:[[@LINE+1]]: type error in return value: '(T).(A.T)' is not implicitly convertible to '(U).(A.T)'
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return x;
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}
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external impl i32 as A where .T == i32 {}
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fn Main() -> i32 {
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return F3(0);
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}
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