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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
9f534ae004
Implements basic support for rewrite constraints as proposed in #2173. Support for associated constants and complex constraints in general is also made more robust: argument deduction now properly computes and substitutes witnesses, and interface declarations track a more correct description of the constraint that they introduce than the one we previously built.
35 lines
1002 B
Plaintext
35 lines
1002 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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// RUN: %{not} %{explorer} %s 2>&1 | %{FileCheck-strict} %s
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// RUN: %{not} %{explorer-trace} %s 2>&1 | %{FileCheck-allow-unmatched} %s
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// AUTOUPDATE: %{explorer} %s
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package ExplorerTest api;
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interface Vector {
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fn Add[me: Self](b: Self) -> Self;
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}
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fn ScaleGeneric[T:! Vector](a: T, s: i32) -> T {
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// CHECK:COMPILATION ERROR: {{.*}}/explorer/testdata/interface/fail_interface_missing_member.carbon:[[@LINE+1]]: member access, Scale not in constraint interface Vector where T is interface Vector
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return a.Scale(s);
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}
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class Point {
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var x: i32;
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var y: i32;
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impl Point as Vector {
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fn Add[me: Point](b: Point) -> Point {
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return {.x = me.x + b.x, .y = me.y + b.y};
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}
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}
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}
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fn Main() -> i32 {
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var a: Point = {.x = 3, .y = 1};
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var b: Point = ScaleGeneric(a, 2);
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return b.x - 6;
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}
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