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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/function/definition/basics.carbon
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+4 -4
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@@ -17,14 +17,14 @@
class C;
// CHECK:STDERR: fail_incomplete_type.carbon:[[@LINE+7]]:6: error: parameter has incomplete type `C` in function definition [IncompleteTypeInFunctionParam]
// CHECK:STDERR: fn F(n: C) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_incomplete_type.carbon:[[@LINE+7]]:13: error: parameter has incomplete type `C` in function definition [IncompleteTypeInFunctionParam]
// CHECK:STDERR: fn F(unused n: C) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_incomplete_type.carbon:[[@LINE-5]]:1: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: class C;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
fn F(n: C) {}
fn F(unused n: C) {}
// CHECK:STDOUT: --- fail_incomplete_type.carbon
// CHECK:STDOUT: