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Implement "unused pattern bindings" p2022 - parsing (#6460)

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This implements proposal #2022, with changes from #3763 and leads
answers on #6448

Detection of unusedness is happening in
~~`toolchain/check/dataflow_analysis.cpp`~~ next PR. See
[here](https://github.com/burakemir/carbon-lang/tree/unused_pattern_bindings_p2022_impl_part2)
for preview.

~~All test cases with unused bindings were updated in order to avoid
polluting test output.~~

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
This commit is contained in:
Burak Emir
2025-12-17 15:40:20 +00:00
committed by GitHub
co-authored by Dana Jansens
parent ad7ea755b0
commit fec6ce2f9f
16 changed files with 851 additions and 66 deletions
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toolchain/parse/handle_pattern.cpp
+11 -3
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@@ -12,15 +12,23 @@ auto HandlePattern(Context& context) -> void {
switch (context.PositionKind()) {
case Lex::TokenKind::OpenParen:
context.PushStateForPattern(StateKind::PatternListAsTuple,
state.in_var_pattern);
state.in_var_pattern,
state.in_unused_pattern);
break;
case Lex::TokenKind::Var:
context.PushStateForPattern(StateKind::VariablePattern,
state.in_var_pattern);
state.in_var_pattern,
state.in_unused_pattern);
break;
case Lex::TokenKind::Unused:
context.PushStateForPattern(StateKind::UnusedPattern,
state.in_var_pattern,
state.in_unused_pattern);
break;
default:
context.PushStateForPattern(StateKind::BindingPattern,
state.in_var_pattern);
state.in_var_pattern,
state.in_unused_pattern);
break;
}
}