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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
4daaa4866f
Also make minor updates to the skeletal design in docs/design/name_lookup.md following #2113, as there are no longer any prelude names that are made available to unqualified name lookup by default. Add `type` to the keyword list in docs/design/lexical_conventions/words.md, following #2360.
42 lines
926 B
Plaintext
42 lines
926 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: 4
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package ExplorerTest api;
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interface MyHashable {
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let Result:! type;
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fn Hash[self: Self]() -> Result;
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}
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constraint HashToIntConvertible {
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impl as MyHashable;
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impl Self.(MyHashable.Result) as ImplicitAs(i32);
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}
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class MyHashValue {
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external impl as ImplicitAs(i32) {
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fn Convert[self: Self]() -> i32 { return 4; }
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}
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}
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class Widget {
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external impl as MyHashable where .Result = MyHashValue {
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fn Hash[self: Self]() -> MyHashValue { return {}; }
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}
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}
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fn MakeSmallHash[T:! HashToIntConvertible](x: T) -> i32 {
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return x.(MyHashable.Hash)();
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}
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fn Main() -> i32 {
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var w: Widget = {};
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return MakeSmallHash(w);
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}
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