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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/declaration/pattern_in_signature.carbon
Vendored
+11 -11
View File
@@ -11,7 +11,7 @@
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/pattern_in_signature.carbon
//@dump-sem-ir-begin
fn F((a: {}, b: {}), c: {}) {}
fn F((unused a: {}, unused b: {}), unused c: {}) {}
//@dump-sem-ir-end
//@dump-sem-ir-begin
@@ -42,26 +42,26 @@ fn CallF(ab: ({}, {}), c: {}) {
// CHECK:STDOUT: %a.param_patt: %pattern_type.a96 = value_param_pattern %a.patt, call_param0 [concrete]
// CHECK:STDOUT: %b.patt: %pattern_type.a96 = value_binding_pattern b [concrete]
// CHECK:STDOUT: %b.param_patt: %pattern_type.a96 = value_param_pattern %b.patt, call_param1 [concrete]
// CHECK:STDOUT: %.loc14_19: %pattern_type.de4 = tuple_pattern (%a.param_patt, %b.param_patt) [concrete]
// CHECK:STDOUT: %.loc14_33: %pattern_type.de4 = tuple_pattern (%a.param_patt, %b.param_patt) [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type.a96 = value_binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.a96 = value_param_pattern %c.patt, call_param2 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %a.param: %empty_struct_type = value_param call_param0
// CHECK:STDOUT: %.loc14_11.1: type = splice_block %.loc14_11.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_11.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_11.3: type = converted %.loc14_11.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %empty_struct_type = value_binding a, %a.param
// CHECK:STDOUT: %b.param: %empty_struct_type = value_param call_param1
// CHECK:STDOUT: %.loc14_18.1: type = splice_block %.loc14_18.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_18.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_18.3: type = converted %.loc14_18.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %empty_struct_type = value_binding a, %a.param
// CHECK:STDOUT: %b.param: %empty_struct_type = value_param call_param1
// CHECK:STDOUT: %.loc14_32.1: type = splice_block %.loc14_32.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_32.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_32.3: type = converted %.loc14_32.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %empty_struct_type = value_binding b, %b.param
// CHECK:STDOUT: %c.param: %empty_struct_type = value_param call_param2
// CHECK:STDOUT: %.loc14_26.1: type = splice_block %.loc14_26.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_26.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_26.3: type = converted %.loc14_26.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc14_47.1: type = splice_block %.loc14_47.3 [concrete = constants.%empty_struct_type] {
// CHECK:STDOUT: %.loc14_47.2: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc14_47.3: type = converted %.loc14_47.2, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %empty_struct_type = value_binding c, %c.param
// CHECK:STDOUT: }
toolchain/check/testdata/function/declaration/ref.carbon
Vendored
+1 -1
View File
@@ -18,7 +18,7 @@
fn F() -> ref i32;
fn G() {
let ref x: i32 = F();
let unused ref x: i32 = F();
}
// CHECK:STDOUT: --- ref_return.carbon