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Add support for ref patterns (#6283)

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Support for `bound`, and for the `ref` tag on arguments, is left as
future work.
This commit is contained in:
Geoff Romer
2025-10-29 16:28:56 +00:00
committed by GitHub
parent fc8db6ac5c
commit 4821eec2f8
52 changed files with 6645 additions and 475 deletions
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toolchain/parse/handle_binding_pattern.cpp
+16
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@@ -34,6 +34,12 @@ auto HandleBindingPattern(Context& context) -> void {
// A `template` keyword may precede the name.
auto template_token = context.ConsumeIf(Lex::TokenKind::Template);
auto ref_token = context.ConsumeIf(Lex::TokenKind::Ref);
if (ref_token && state.in_var_pattern) {
CARBON_DIAGNOSTIC(RefInsideVar, Error, "found `ref` inside `var` pattern");
context.emitter().Emit(*ref_token, RefInsideVar);
state.has_error = true;
}
// The first item should be an identifier, the placeholder `_`, or `self`.
if (auto identifier = context.ConsumeIf(Lex::TokenKind::Identifier)) {
@@ -67,6 +73,16 @@ auto HandleBindingPattern(Context& context) -> void {
context.AddNode(NodeKind::TemplateBindingName, *template_token,
state.has_error);
}
if (ref_token) {
if (token_kind != Lex::TokenKind::Colon && !state.has_error) {
CARBON_DIAGNOSTIC(ExpectedRuntimeBindingPatternAfterRef, Error,
"expected `:` binding after `ref`");
context.emitter().Emit(*ref_token,
ExpectedRuntimeBindingPatternAfterRef);
state.has_error = true;
}
context.AddNode(NodeKind::RefBindingName, *ref_token, state.has_error);
}
state.kind = token_kind == Lex::TokenKind::Colon
? StateKind::BindingPatternFinishAsRegular