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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_local_decl.carbon
Vendored
+10 -10
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@@ -40,15 +40,15 @@ library "[[@TEST_NAME]]";
fn F() {
// CHECK:STDERR: fail_access.carbon:[[@LINE+4]]:3: error: `private` not allowed; requires class or file scope [ModifierPrivateNotAllowed]
// CHECK:STDERR: private var v: {};
// CHECK:STDERR: private var unused v: {};
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
private var v: {};
private var unused v: {};
// CHECK:STDERR: fail_access.carbon:[[@LINE+4]]:3: error: `protected` not allowed; requires class scope [ModifierProtectedNotAllowed]
// CHECK:STDERR: protected var w: {};
// CHECK:STDERR: protected var unused w: {};
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
protected var w: {};
protected var unused w: {};
}
// CHECK:STDOUT: --- fail_virtual.carbon
@@ -133,9 +133,9 @@ fn F() {
// CHECK:STDOUT: %v.var_patt: %pattern_type.a96 = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref %empty_struct_type = var %v.var_patt
// CHECK:STDOUT: %.loc9_19.1: type = splice_block %.loc9_19.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc9_19.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc9_19.3: type = converted %.loc9_19.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc9_26.1: type = splice_block %.loc9_26.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc9_26.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc9_26.3: type = converted %.loc9_26.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref %empty_struct_type = ref_binding v, %v.var
// CHECK:STDOUT: name_binding_decl {
@@ -143,9 +143,9 @@ fn F() {
// CHECK:STDOUT: %w.var_patt: %pattern_type.a96 = var_pattern %w.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %w.var: ref %empty_struct_type = var %w.var_patt
// CHECK:STDOUT: %.loc14_21.1: type = splice_block %.loc14_21.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_21.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_21.3: type = converted %.loc14_21.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc14_28.1: type = splice_block %.loc14_28.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_28.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_28.3: type = converted %.loc14_28.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %w: ref %empty_struct_type = ref_binding w, %w.var
// CHECK:STDOUT: %DestroyOp.bound.loc14: <bound method> = bound_method %w.var, constants.%DestroyOp