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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/convert.carbon
Vendored
+33 -33
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@@ -26,9 +26,9 @@ import Cpp library "enum.h";
//@dump-sem-ir-begin
fn F() {
let a: i16 = Cpp.Enum.a as i16;
let b: Cpp.Enum = (42 as i16) as Cpp.Enum;
let c: Cpp.Other = Cpp.a as Cpp.Other;
let unused a: i16 = Cpp.Enum.a as i16;
let unused b: Cpp.Enum = (42 as i16) as Cpp.Enum;
let unused c: Cpp.Other = Cpp.a as Cpp.Other;
}
//@dump-sem-ir-end
@@ -144,15 +144,15 @@ fn F() {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc8: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %a.ref.loc8: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0.420]
// CHECK:STDOUT: %int_16.loc8_30: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_30: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %.loc8_27.1: %i16 = as_compatible %a.ref.loc8 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_27.2: %i16 = converted %a.ref.loc8, %.loc8_27.1 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_10: type = splice_block %i16.loc8_10 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16.loc8_10: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_10: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %int_16.loc8_37: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_37: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %.loc8_34.1: %i16 = as_compatible %a.ref.loc8 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_34.2: %i16 = converted %a.ref.loc8, %.loc8_34.1 [concrete = constants.%int_0.320]
// CHECK:STDOUT: %.loc8_17: type = splice_block %i16.loc8_17 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16.loc8_17: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc8_17: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: }
// CHECK:STDOUT: %a: %i16 = value_binding a, %.loc8_27.2
// CHECK:STDOUT: %a: %i16 = value_binding a, %.loc8_34.2
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %b.patt: %pattern_type.ebf = value_binding_pattern b [concrete]
// CHECK:STDOUT: }
@@ -160,35 +160,35 @@ fn F() {
// CHECK:STDOUT: %int_16.loc9: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16.loc9: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: %impl.elem0: %.70c = impl_witness_access constants.%As.impl_witness.b61, element0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.a42]
// CHECK:STDOUT: %bound_method.loc9_25.1: <bound method> = bound_method %int_42, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %bound_method.loc9_32.1: <bound method> = bound_method %int_42, %impl.elem0 [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.bound]
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Core.IntLiteral.as.As.impl.Convert(constants.%int_16) [concrete = constants.%Core.IntLiteral.as.As.impl.Convert.specific_fn]
// CHECK:STDOUT: %bound_method.loc9_25.2: <bound method> = bound_method %int_42, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i16 = call %bound_method.loc9_25.2(%int_42) [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_25.1: %i16 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_25.2: %i16 = converted %int_42, %.loc9_25.1 [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %Cpp.ref.loc9_36: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_39: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %.loc9_33.1: %Enum = as_compatible %.loc9_25.2 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_33.2: %Enum = converted %.loc9_25.2, %.loc9_33.1 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_13: type = splice_block %Enum.ref.loc9_13 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc9_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_13: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %bound_method.loc9_32.2: <bound method> = bound_method %int_42, %specific_fn [concrete = constants.%bound_method]
// CHECK:STDOUT: %Core.IntLiteral.as.As.impl.Convert.call: init %i16 = call %bound_method.loc9_32.2(%int_42) [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_32.1: %i16 = value_of_initializer %Core.IntLiteral.as.As.impl.Convert.call [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %.loc9_32.2: %i16 = converted %int_42, %.loc9_32.1 [concrete = constants.%int_42.a0e]
// CHECK:STDOUT: %Cpp.ref.loc9_43: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_46: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: %.loc9_40.1: %Enum = as_compatible %.loc9_32.2 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_40.2: %Enum = converted %.loc9_32.2, %.loc9_40.1 [concrete = constants.%int_42.c3a]
// CHECK:STDOUT: %.loc9_20: type = splice_block %Enum.ref.loc9_20 [concrete = constants.%Enum] {
// CHECK:STDOUT: %Cpp.ref.loc9_17: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Enum.ref.loc9_20: type = name_ref Enum, imports.%Enum.decl [concrete = constants.%Enum]
// CHECK:STDOUT: }
// CHECK:STDOUT: %b: %Enum = value_binding b, %.loc9_33.2
// CHECK:STDOUT: %b: %Enum = value_binding b, %.loc9_40.2
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.c06 = value_binding_pattern c [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc10_22: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc10_29: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %a.ref.loc10: %Enum = name_ref a, imports.%int_0 [concrete = constants.%int_0.420]
// CHECK:STDOUT: %Cpp.ref.loc10_31: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_34: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: %.loc10_28.1: %Other = as_compatible %a.ref.loc10 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_28.2: %Other = converted %a.ref.loc10, %.loc10_28.1 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_13: type = splice_block %Other.ref.loc10_13 [concrete = constants.%Other] {
// CHECK:STDOUT: %Cpp.ref.loc10_10: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_13: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: %Cpp.ref.loc10_38: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_41: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: %.loc10_35.1: %Other = as_compatible %a.ref.loc10 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_35.2: %Other = converted %a.ref.loc10, %.loc10_35.1 [concrete = constants.%int_0.fa2]
// CHECK:STDOUT: %.loc10_20: type = splice_block %Other.ref.loc10_20 [concrete = constants.%Other] {
// CHECK:STDOUT: %Cpp.ref.loc10_17: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Other.ref.loc10_20: type = name_ref Other, imports.%Other.decl [concrete = constants.%Other]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c: %Other = value_binding c, %.loc10_28.2
// CHECK:STDOUT: %c: %Other = value_binding c, %.loc10_35.2
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: