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carbon-lang/explorer/testdata/constraint/where_self.carbon
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josh11bandGeoff Romer 46503c0a9d Explorer and toolchain changes to implement #2483 (#2707)
This PR is making two main changes to the Explorer and Toolchain:
- Replace the `is` keyword in `where SomeType is SomeInterface` with `impls`, so it is `where SomeType impls SomeInterface`
- Rewrite uses of the "impls" to something else to avoid, frequently "`impl` declarations" or "implementations", to avoid confusion with the `impls` keyword.

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Co-authored-by: Geoff Romer <gromer@google.com>
2023-03-28 12:28:52 -07:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// RUN: %{explorer-run}
// RUN: %{explorer-run-trace}
// CHECK:STDOUT: result: 12
package ExplorerTest api;
interface SwizzleWith(T:! type) {
fn Op[self: Self](x: T) -> i32;
}
// TODO: There should be some way to write this that includes
// `SwizzleWith(.Self)` in the list of lookup contexts.
alias Swizzle = type where .Self impls SwizzleWith(.Self);
impl i32 as SwizzleWith(i32) {
fn Op[self: Self](x: Self) -> Self { return self * 10 + x; }
}
fn F[T:! Swizzle](v: T, w: T) -> i32 {
return v.(SwizzleWith(T).Op)(w);
}
fn Main() -> i32 {
var one: i32 = 1;
var two: i32 = 2;
return F(one, two);
}