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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/function/void_pointer.carbon
Vendored
+18 -18
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@@ -34,7 +34,7 @@ auto foo() -> void* _Nonnull;
fn F() {
//@dump-sem-ir-begin
let output: Cpp.void* = Cpp.foo();
let unused output: Cpp.void* = Cpp.foo();
//@dump-sem-ir-end
}
@@ -76,7 +76,7 @@ auto foo() -> void*;
fn F() {
//@dump-sem-ir-begin
let output: Core.Optional(Cpp.void*) = Cpp.foo();
let unused output: Core.Optional(Cpp.void*) = Cpp.foo();
//@dump-sem-ir-end
}
@@ -178,17 +178,17 @@ fn F() {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %output.patt: %pattern_type = value_binding_pattern output [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc10_27: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc10_34: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.call: init %ptr = call imports.%foo.decl()
// CHECK:STDOUT: %.loc10_23: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref.loc10_15: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %.loc10_30: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref.loc10_22: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %void.ref: type = name_ref void, constants.%Cpp.void [concrete = constants.%Cpp.void]
// CHECK:STDOUT: %ptr: type = ptr_type %void.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc10_35.1: %ptr = value_of_initializer %foo.call
// CHECK:STDOUT: %.loc10_35.2: %ptr = converted %foo.call, %.loc10_35.1
// CHECK:STDOUT: %output: %ptr = value_binding output, %.loc10_35.2
// CHECK:STDOUT: %.loc10_42.1: %ptr = value_of_initializer %foo.call
// CHECK:STDOUT: %.loc10_42.2: %ptr = converted %foo.call, %.loc10_42.1
// CHECK:STDOUT: %output: %ptr = value_binding output, %.loc10_42.2
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
@@ -463,25 +463,25 @@ fn F() {
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %output.patt: %pattern_type.cec = value_binding_pattern output [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc10_42: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc10_49: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo.ref: %foo.cpp_overload_set.type = name_ref foo, imports.%foo.cpp_overload_set.value [concrete = constants.%foo.cpp_overload_set.value]
// CHECK:STDOUT: %foo.call: init %Optional.bb8 = call imports.%foo.decl()
// CHECK:STDOUT: %.loc10_38.1: type = splice_block %Optional [concrete = constants.%Optional.bb8] {
// CHECK:STDOUT: %.loc10_45.1: type = splice_block %Optional [concrete = constants.%Optional.bb8] {
// CHECK:STDOUT: %Core.ref: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %Optional.ref: %Optional.type = name_ref Optional, imports.%Core.Optional [concrete = constants.%Optional.generic]
// CHECK:STDOUT: %Cpp.ref.loc10_29: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Cpp.ref.loc10_36: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %void.ref: type = name_ref void, constants.%Cpp.void [concrete = constants.%Cpp.void]
// CHECK:STDOUT: %ptr: type = ptr_type %void.ref [concrete = constants.%ptr.874]
// CHECK:STDOUT: %OptionalStorage.facet: %OptionalStorage.type = facet_value %ptr, (constants.%OptionalStorage.impl_witness.32c) [concrete = constants.%OptionalStorage.facet]
// CHECK:STDOUT: %.loc10_38.2: %OptionalStorage.type = converted %ptr, %OptionalStorage.facet [concrete = constants.%OptionalStorage.facet]
// CHECK:STDOUT: %.loc10_45.2: %OptionalStorage.type = converted %ptr, %OptionalStorage.facet [concrete = constants.%OptionalStorage.facet]
// CHECK:STDOUT: %Optional: type = class_type @Optional, @Optional(constants.%OptionalStorage.facet) [concrete = constants.%Optional.bb8]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc10_50.1: ref %Optional.bb8 = temporary_storage
// CHECK:STDOUT: %.loc10_50.2: ref %Optional.bb8 = temporary %.loc10_50.1, %foo.call
// CHECK:STDOUT: %.loc10_50.3: %Optional.bb8 = acquire_value %.loc10_50.2
// CHECK:STDOUT: %output: %Optional.bb8 = value_binding output, %.loc10_50.3
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %.loc10_50.2, constants.%DestroyOp.b0ebf8.2
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%.loc10_50.2)
// CHECK:STDOUT: %.loc10_57.1: ref %Optional.bb8 = temporary_storage
// CHECK:STDOUT: %.loc10_57.2: ref %Optional.bb8 = temporary %.loc10_57.1, %foo.call
// CHECK:STDOUT: %.loc10_57.3: %Optional.bb8 = acquire_value %.loc10_57.2
// CHECK:STDOUT: %output: %Optional.bb8 = value_binding output, %.loc10_57.3
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %.loc10_57.2, constants.%DestroyOp.b0ebf8.2
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%.loc10_57.2)
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT: