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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.
37 lines
1.0 KiB
Plaintext
37 lines
1.0 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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// TODO: Should this work?
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package ExplorerTest api;
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interface Vector {
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let Dim:! i32;
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}
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external impl (i32, i32, i32) as Vector where .Dim = 3 {}
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class Point(Scalar:! Type, Dim:! i32) {}
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fn F[Scalar:! Type, V:! Vector where .Dim == 3](p: Point(Scalar, V.Dim), v: V) {}
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fn G[Scalar:! Type](p: Point(Scalar, 3)) {}
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fn H[V:! Vector where .Dim == 3](v: V) {
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var p: Point(i32, V.Dim) = {};
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// CHECK:STDERR: COMPILATION ERROR: {{.*}}/explorer/testdata/assoc_const/fail_match_in_deduction.carbon:[[@LINE+1]]: mismatch in non-type values, `(V).(Vector.Dim)` != `3`
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G(p);
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}
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fn Main() -> i32 {
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var p: Point(i32, 3) = {};
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// Deduce Point(Scalar, V.Dim) from Point(i32, 3).
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F(p, (0, 0, 0));
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// Deduce Point(Scalar, 3) from Point(i32, V.Dim).
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H((0, 0, 0));
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return 0;
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}
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