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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>
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
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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// TODO: This library is not part of the design. Either write a matching
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// proposal or remove this.
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package Core library "range";
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import library "prelude/destroy";
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import library "prelude/iterate";
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import library "prelude/operators/arithmetic";
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import library "prelude/operators/as";
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import library "prelude/operators/comparison";
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import library "prelude/types/int";
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import library "prelude/types/int_literal";
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import library "prelude/types/optional";
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class IntRange(N:! IntLiteral) {
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fn Make(start: Int(N), end: Int(N)) -> Self {
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return {.start = start, .end = end};
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}
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impl as Iterate where .CursorType = Int(N) and .ElementType = Int(N) {
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fn NewCursor(self) -> Int(N) { return self.start; }
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fn Next(self, cursor: Int(N)*) -> Optional(Int(N)) {
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var value: Int(N) = *cursor;
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if (value < self.end) {
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++*cursor;
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return Optional(Int(N)).Some(value);
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} else {
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return Optional(Int(N)).None();
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}
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}
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}
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private var start: Int(N);
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private var end: Int(N);
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}
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fn Range(end: i32) -> IntRange(32) {
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return IntRange(32).Make(0, end);
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}
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fn InclusiveRange(start: i32, end: i32) -> IntRange(32) {
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return IntRange(32).Make(start, end + 1);
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}
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