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Implement unused pattern bindings, continued (#6518)

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Implementation of unused pattern bindings #2022, continued.

Whereas previous PR #6460 took care of parsing, and PR #6479 prepared
the stage by using _ in some test cases, this PR has the the actual
implementation, using a simple dataflow analysis.

---------

Co-authored-by: Burak Emir <bqe@google.com>
Co-authored-by: jonmeow <jperkins@google.com>
This commit is contained in:
Burak Emir
2026-02-19 23:33:36 +00:00
committed by GitHub
co-authored by Burak Emir jonmeow
parent bea24a8bee
commit fdb188ccfd
366 changed files with 8453 additions and 7996 deletions
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toolchain/parse/testdata/generics/named_constraint/invalid_method.carbon
Vendored
+9 -8
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@@ -15,7 +15,7 @@ constraint E {
constraint Foo {
// This is an error in the check phase.
fn DefinedMethod[self: Self](b: Self) -> Self {}
fn DefinedMethod[unused self: Self](b: Self) -> Self {}
}
// CHECK:STDOUT: - filename: invalid_method.carbon
@@ -46,10 +46,11 @@ constraint Foo {
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameBeforeParams', text: 'DefinedMethod'},
// CHECK:STDOUT: {kind: 'ImplicitParamListStart', text: '['},
// CHECK:STDOUT: {kind: 'SelfValueName', text: 'self'},
// CHECK:STDOUT: {kind: 'SelfTypeNameExpr', text: 'Self'},
// CHECK:STDOUT: {kind: 'LetBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 5},
// CHECK:STDOUT: {kind: 'SelfValueName', text: 'self'},
// CHECK:STDOUT: {kind: 'SelfTypeNameExpr', text: 'Self'},
// CHECK:STDOUT: {kind: 'LetBindingPattern', text: ':', subtree_size: 3},
// CHECK:STDOUT: {kind: 'UnusedPattern', text: 'unused', subtree_size: 4},
// CHECK:STDOUT: {kind: 'ImplicitParamList', text: ']', subtree_size: 6},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeParams', text: 'b'},
// CHECK:STDOUT: {kind: 'SelfTypeNameExpr', text: 'Self'},
@@ -57,8 +58,8 @@ constraint Foo {
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 5},
// CHECK:STDOUT: {kind: 'SelfTypeNameExpr', text: 'Self'},
// CHECK:STDOUT: {kind: 'ReturnType', text: '->', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 15},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 16},
// CHECK:STDOUT: {kind: 'NamedConstraintDefinition', text: '}', subtree_size: 20},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 16},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 17},
// CHECK:STDOUT: {kind: 'NamedConstraintDefinition', text: '}', subtree_size: 21},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]