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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/fail_decl_param_mismatch.carbon
Vendored
+10 -10
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@@ -14,13 +14,13 @@
fn F();
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE+7]]:1: error: redeclaration differs because of parameter count of 1 [RedeclParamCountDiffers]
// CHECK:STDERR: fn F(x: ()) {}
// CHECK:STDERR: ^~~~~~~~~~~~~
// CHECK:STDERR: fn F(unused x: ()) {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE-4]]:1: note: previously declared with parameter count of 0 [RedeclParamCountPrevious]
// CHECK:STDERR: fn F();
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
fn F(x: ()) {}
fn F(unused x: ()) {}
fn G(x: ());
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE+7]]:1: error: redeclaration differs because of parameter count of 0 [RedeclParamCountDiffers]
@@ -33,11 +33,11 @@ fn G(x: ());
fn G() {}
fn H(x: ());
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE+4]]:9: error: `Core.Bool` implicitly referenced here, but package `Core` not found [CoreNotFound]
// CHECK:STDERR: fn H(x: bool) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE+4]]:16: error: `Core.Bool` implicitly referenced here, but package `Core` not found [CoreNotFound]
// CHECK:STDERR: fn H(unused x: bool) {}
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
fn H(x: bool) {}
fn H(unused x: bool) {}
fn I();
// CHECK:STDERR: fail_decl_param_mismatch.carbon:[[@LINE+7]]:1: error: function redeclaration differs because return type is `()` [FunctionRedeclReturnTypeDiffers]
@@ -121,9 +121,9 @@ fn K() -> {} { return {}; }
// CHECK:STDOUT: %x.param_patt: %pattern_type.cb1 = value_param_pattern %x.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %x.param: %empty_tuple.type = value_param call_param0
// CHECK:STDOUT: %.loc23_10.1: type = splice_block %.loc23_10.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc23_10.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc23_10.3: type = converted %.loc23_10.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc23_17.1: type = splice_block %.loc23_17.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc23_17.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc23_17.3: type = converted %.loc23_17.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %x: %empty_tuple.type = value_binding x, %x.param
// CHECK:STDOUT: }