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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/check/testdata/class/fail_generic_method.carbon
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+10 -10
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@@ -19,19 +19,19 @@ class Class(T:! type) {
// TODO: The follow-on errors here aren't great. Investigate whether we can
// enter the scope anyway if the parameters don't match.
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+15]]:10: error: type `<pattern for I>` of parameter 1 in redeclaration differs from previous parameter type `<pattern for type>` [RedeclParamDiffersType]
// CHECK:STDERR: fn Class(N:! I).F[self: Self](n: T) {}
// CHECK:STDERR: ^
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+15]]:17: error: type `<pattern for I>` of parameter 1 in redeclaration differs from previous parameter type `<pattern for type>` [RedeclParamDiffersType]
// CHECK:STDERR: fn Class(unused N:! I).F[unused self: Self](unused n: T) {}
// CHECK:STDERR: ^
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE-10]]:13: note: previous declaration's corresponding parameter here [RedeclParamPrevious]
// CHECK:STDERR: class Class(T:! type) {
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+8]]:25: error: name `Self` not found [NameNotFound]
// CHECK:STDERR: fn Class(N:! I).F[self: Self](n: T) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+8]]:39: error: name `Self` not found [NameNotFound]
// CHECK:STDERR: fn Class(unused N:! I).F[unused self: Self](unused n: T) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+4]]:34: error: name `T` not found [NameNotFound]
// CHECK:STDERR: fn Class(N:! I).F[self: Self](n: T) {}
// CHECK:STDERR: ^
// CHECK:STDERR: fail_generic_method.carbon:[[@LINE+4]]:55: error: name `T` not found [NameNotFound]
// CHECK:STDERR: fn Class(unused N:! I).F[unused self: Self](unused n: T) {}
// CHECK:STDERR: ^
// CHECK:STDERR:
fn Class(N:! I).F[self: Self](n: T) {}
fn Class(unused N:! I).F[unused self: Self](unused n: T) {}