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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/interop/cpp/enum/member.carbon
Vendored
+13 -13
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@@ -25,8 +25,8 @@ import Cpp library "enum_member.h";
//@dump-sem-ir-begin
fn F() {
let a: Cpp.A.E = Cpp.A.a;
let b: Cpp.A.E = Cpp.A.E.b;
let unused a: Cpp.A.E = Cpp.A.a;
let unused b: Cpp.A.E = Cpp.A.E.b;
}
//@dump-sem-ir-end
@@ -62,26 +62,26 @@ fn F() {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %a.patt: %pattern_type = value_binding_pattern a [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_20: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc8_23: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %Cpp.ref.loc8_27: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc8_30: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %a.ref: %E = name_ref a, imports.%int_0 [concrete = constants.%int_0]
// CHECK:STDOUT: %.loc8: type = splice_block %E.ref.loc8 [concrete = constants.%E] {
// CHECK:STDOUT: %Cpp.ref.loc8_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc8_13: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %Cpp.ref.loc8_17: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc8_20: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %E.ref.loc8: type = name_ref E, imports.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %E = value_binding a, %a.ref
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %pattern_type = value_binding_pattern b [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc9_20: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc9_23: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %E.ref.loc9_25: type = name_ref E, imports.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: %Cpp.ref.loc9_27: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc9_30: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %E.ref.loc9_32: type = name_ref E, imports.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: %b.ref: %E = name_ref b, imports.%int_1 [concrete = constants.%int_1]
// CHECK:STDOUT: %.loc9: type = splice_block %E.ref.loc9_15 [concrete = constants.%E] {
// CHECK:STDOUT: %Cpp.ref.loc9_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc9_13: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %E.ref.loc9_15: type = name_ref E, imports.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: %.loc9: type = splice_block %E.ref.loc9_22 [concrete = constants.%E] {
// CHECK:STDOUT: %Cpp.ref.loc9_17: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %A.ref.loc9_20: type = name_ref A, imports.%A.decl [concrete = constants.%A]
// CHECK:STDOUT: %E.ref.loc9_22: type = name_ref E, imports.%E.decl [concrete = constants.%E]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %E = value_binding b, %b.ref
// CHECK:STDOUT: return