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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/impl/incomplete.carbon
Vendored
+11 -11
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@@ -192,7 +192,7 @@ interface X {
}
// Requires `X` to be complete, doesn't require Z to be complete.
fn F(T:! X where .X1 = {}) {}
fn F(unused T:! X where .X1 = {}) {}
// --- fail_incomplete_constraint.carbon
library "[[@TEST_NAME]]";
@@ -803,23 +803,23 @@ interface B {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc16_12.1: type = splice_block %.loc16_12.2 [concrete = constants.%X_where.type] {
// CHECK:STDOUT: %.loc16_19.1: type = splice_block %.loc16_19.2 [concrete = constants.%X_where.type] {
// CHECK:STDOUT: %.Self.1: %type = symbolic_binding .Self [symbolic_self = constants.%.Self.c39]
// CHECK:STDOUT: %X.ref: type = name_ref X, file.%X.decl [concrete = constants.%X.type]
// CHECK:STDOUT: %.Self.2: %X.type = symbolic_binding .Self [symbolic_self = constants.%.Self.637]
// CHECK:STDOUT: %.Self.ref: %X.type = name_ref .Self, %.Self.2 [symbolic_self = constants.%.Self.637]
// CHECK:STDOUT: %.Self.as_type: type = facet_access_type %.Self.ref [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT: %.loc16_18: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT: %.loc16_25: type = converted %.Self.ref, %.Self.as_type [symbolic_self = constants.%.Self.binding.as_type]
// CHECK:STDOUT: %X1.ref: %X.assoc_type = name_ref X1, @X1.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: type = impl_witness_access constants.%X.lookup_impl_witness, element0 [symbolic_self = constants.%impl.elem0]
// CHECK:STDOUT: %.loc16_25.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc16_25.2: type = converted %.loc16_25.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc16_12.2: type = where_expr %.Self.2 [concrete = constants.%X_where.type] {
// CHECK:STDOUT: %.loc16_32.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc16_32.2: type = converted %.loc16_32.1, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %.loc16_19.2: type = where_expr %.Self.2 [concrete = constants.%X_where.type] {
// CHECK:STDOUT: requirement_base_facet_type constants.%X.type
// CHECK:STDOUT: requirement_rewrite %impl.elem0, %.loc16_25.2
// CHECK:STDOUT: requirement_rewrite %impl.elem0, %.loc16_32.2
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc16_6.2: %X_where.type = symbolic_binding T, 0 [symbolic = %T.loc16_6.1 (constants.%T)]
// CHECK:STDOUT: %T.loc16_13.2: %X_where.type = symbolic_binding T, 0 [symbolic = %T.loc16_13.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -886,8 +886,8 @@ interface B {
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.806)]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @F(%T.loc16_6.2: %X_where.type) {
// CHECK:STDOUT: %T.loc16_6.1: %X_where.type = symbolic_binding T, 0 [symbolic = %T.loc16_6.1 (constants.%T)]
// CHECK:STDOUT: generic fn @F(%T.loc16_13.2: %X_where.type) {
// CHECK:STDOUT: %T.loc16_13.1: %X_where.type = symbolic_binding T, 0 [symbolic = %T.loc16_13.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
@@ -929,7 +929,7 @@ interface B {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%T) {
// CHECK:STDOUT: %T.loc16_6.1 => constants.%T
// CHECK:STDOUT: %T.loc16_13.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_incomplete_constraint.carbon