mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-10-05 09:31:04 +01:00
Richard Smith
2fef76e58c
`.Self` is modeled as a new kind of expression, `DotSelfExpression`. Name resolution associates each occurrence of a `DotSelfExpression` with a generic binding, much like for an `IdentifierExpression`. Both `:!` bindings and `where` expressions bring `.Self` into scope. The tentative intent is that if there are multiple `.Self`s in scope and they refer to different bindings, the result of using a `.Self` expression is an ambiguity error, but that is not implemented in this patch. Instead, like for `IdentifierExpression`s, we find the innermost enclosing definition of `.Self`. `.Foo` expressions are rewritten to `.Self.Foo`, but this isn't enough to make them do anything useful, because associated constants aren't supported in general yet.
32 lines
1020 B
Plaintext
32 lines
1020 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: %{explorer} %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes=false %s
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// RUN: %{explorer} --parser_debug --trace_file=- %s 2>&1 | \
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// RUN: %{FileCheck} --match-full-lines --allow-unused-prefixes %s
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// AUTOUPDATE: %{explorer} %s
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// CHECK: result: 12
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package ExplorerTest api;
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interface A { fn F() -> i32; }
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interface B { fn F() -> i32; }
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impl i32 as A { fn F() -> i32 { return 1; } }
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impl i32 as B { fn F() -> i32 { return 2; } }
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fn GetA[T:! A](x: T) -> i32 { return x.F(); }
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fn GetAB[T:! B where .Self is A](x: T) -> i32 {
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// Note that there's no ambiguity in the use of the name F here.
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// `x.F` is `x.(B.F)` because the constraint only treats `B`, not
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// `A`, as a lookup context.
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return 10 * GetA(x) + x.F();
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}
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fn Main() -> i32 {
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var v: i32 = 0;
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return GetAB(v);
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}
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