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Chandler Carruthandjosh11b
7871237c15
Implements proposal #7016: `self` moves from the deduced implicit list (`fn F[self: Self]()`) to the front of the explicit list. Its type may be written explicitly (`fn F(self: Self)`) or omitted, in which case it defaults to `Self` (`fn F(self)`, `fn F(ref self)`); `self` in the implicit list is rejected. Throughout checking, `self` is modeled as the first explicit parameter. Because a method is just a function whose first parameter is `self`, it can also be called as an ordinary function with the receiver passed explicitly (`Type.M(obj, ...)`), not only as `obj.M(...)`. A new `SemIR::CallArgParamPatterns` helper chooses the parameters matched against the explicit arguments, excluding a leading `self` only when it is supplied as a method-call receiver; arity checking, conversion, and generic deduction use it. The resulting SemIR and lowering are unchanged: `self` is still `call_param0`, and witnesses, thunks, and vtables are unaffected. An omitted `self` type is parsed as a `SelfBindingPattern` node with no type expression; checking synthesizes the `Self` type so it behaves exactly like `self: Self`. However, the exact spelling used must match between a forward declaration and a definition, following #3763's rules around declaration matching. Generated functions, thunks, and C++ interop import/export build `self` as the first explicit parameter, and the `self`-type override (e.g. Derived->Base for a virtual override) applies to the explicit `self`. Placement is validated by new diagnostics: `SelfInImplicitParamList`, `SelfNotFirstParam`, and `SelfOutsideParamList`. The benchmark source generator and the documentation adopt the `(self)` shorthand; the prelude, the examples, and the test data are migrated in the following commits. Assisted-by: Claude Code with Claude Opus 4.7 --------- Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
47 lines
868 B
Plaintext
47 lines
868 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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// More single line comments
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package Carbon api;
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interface HasValueParam(T:! type, V:! T) {
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fn Go(self) -> T;
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}
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impl () as HasValueParam(i32, 5) {
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fn Go(self) -> i32 { return 42; }
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}
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class Point {
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fn Origin() -> Self {
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return {.x = 0, .y = 0};
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}
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var x: i32;
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var y: i32;
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}
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fn Procedure() -> i32 {
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returned var zoop: i32 = 0;
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while (DoSomeJob() {
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zoop += 1;
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}
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return var;
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}
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fn Main() -> i32 {
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let str = "Hello world";
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let hex = 0xABCDEF1234567890;
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let bin = 0b0000111001010010;
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let dec = 123456789012345678;
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let big: Carbon.Int(1024) = 1234;
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let aaa: auto = "Carbon";
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let view: StringView = "Carbon";
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return Procedure();
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}
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