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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/using.carbon
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+20 -20
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@@ -42,10 +42,10 @@ import Cpp library "enum.h";
//@dump-sem-ir-begin
fn F() {
let col : Cpp.Color = Cpp.Color.Red;
let colb : Cpp.Color = Cpp.Blue;
let pet : Cpp.Zoo.Animal = Cpp.Zoo.Animal.Cat;
let pet2 : Cpp.Zoo.Animal = Cpp.Dog;
let unused col : Cpp.Color = Cpp.Color.Red;
let unused colb : Cpp.Color = Cpp.Blue;
let unused pet : Cpp.Zoo.Animal = Cpp.Zoo.Animal.Cat;
let unused pet2 : Cpp.Zoo.Animal = Cpp.Dog;
}
//@dump-sem-ir-end
@@ -91,44 +91,44 @@ fn F() {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %col.patt: %pattern_type.839 = value_binding_pattern col [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc18_25: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Color.ref.loc18_28: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
// CHECK:STDOUT: %Cpp.ref.loc18_32: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Color.ref.loc18_35: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
// CHECK:STDOUT: %Red.ref: %Color = name_ref Red, imports.%int_0.40a [concrete = constants.%int_0.40a]
// CHECK:STDOUT: %.loc18: type = splice_block %Color.ref.loc18_16 [concrete = constants.%Color] {
// CHECK:STDOUT: %Cpp.ref.loc18_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Color.ref.loc18_16: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
// CHECK:STDOUT: %.loc18: type = splice_block %Color.ref.loc18_23 [concrete = constants.%Color] {
// CHECK:STDOUT: %Cpp.ref.loc18_20: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Color.ref.loc18_23: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
// CHECK:STDOUT: }
// CHECK:STDOUT: %col: %Color = value_binding col, %Red.ref
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %colb.patt: %pattern_type.839 = value_binding_pattern colb [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc19_26: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc19_33: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Blue.ref: %Color = name_ref Blue, imports.%int_1.a8e [concrete = constants.%int_1.a8e]
// CHECK:STDOUT: %.loc19: type = splice_block %Color.ref.loc19 [concrete = constants.%Color] {
// CHECK:STDOUT: %Cpp.ref.loc19_14: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc19_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Color.ref.loc19: type = name_ref Color, imports.%Color.decl [concrete = constants.%Color]
// CHECK:STDOUT: }
// CHECK:STDOUT: %colb: %Color = value_binding colb, %Blue.ref
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %pet.patt: %pattern_type.d9d = value_binding_pattern pet [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc20_30: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Zoo.ref.loc20_33: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
// CHECK:STDOUT: %Animal.ref.loc20_37: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
// CHECK:STDOUT: %Cpp.ref.loc20_37: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Zoo.ref.loc20_40: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
// CHECK:STDOUT: %Animal.ref.loc20_44: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
// CHECK:STDOUT: %Cat.ref: %Animal = name_ref Cat, imports.%int_0.83f [concrete = constants.%int_0.83f]
// CHECK:STDOUT: %.loc20: type = splice_block %Animal.ref.loc20_20 [concrete = constants.%Animal] {
// CHECK:STDOUT: %Cpp.ref.loc20_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Zoo.ref.loc20_16: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
// CHECK:STDOUT: %Animal.ref.loc20_20: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
// CHECK:STDOUT: %.loc20: type = splice_block %Animal.ref.loc20_27 [concrete = constants.%Animal] {
// CHECK:STDOUT: %Cpp.ref.loc20_20: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Zoo.ref.loc20_23: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
// CHECK:STDOUT: %Animal.ref.loc20_27: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
// CHECK:STDOUT: }
// CHECK:STDOUT: %pet: %Animal = value_binding pet, %Cat.ref
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %pet2.patt: %pattern_type.d9d = value_binding_pattern pet2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc21_31: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc21_38: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Dog.ref: %Animal = name_ref Dog, imports.%int_1.afa [concrete = constants.%int_1.afa]
// CHECK:STDOUT: %.loc21: type = splice_block %Animal.ref.loc21 [concrete = constants.%Animal] {
// CHECK:STDOUT: %Cpp.ref.loc21_14: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc21_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Zoo.ref.loc21: type = name_ref Zoo, imports.%Zoo.decl [concrete = constants.%Zoo]
// CHECK:STDOUT: %Animal.ref.loc21: type = name_ref Animal, imports.%Animal.decl [concrete = constants.%Animal]
// CHECK:STDOUT: }