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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/full_semir.carbon
Vendored
+10 -10
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@@ -62,7 +62,7 @@ library "[[@TEST_NAME]]";
import Cpp library "short_return.h";
fn F() {
let x: i16 = Cpp.foo_short();
let unused x: i16 = Cpp.foo_short();
}
// CHECK:STDOUT: --- import_short_param.carbon
@@ -361,19 +361,19 @@ fn F() {
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %foo_short.ref: %foo_short.cpp_overload_set.type = name_ref foo_short, imports.%foo_short.cpp_overload_set.value [concrete = constants.%foo_short.cpp_overload_set.value]
// CHECK:STDOUT: %.loc7_30.1: ref %i16 = temporary_storage
// CHECK:STDOUT: %addr: %ptr = addr_of %.loc7_30.1
// CHECK:STDOUT: %.loc7_37.1: ref %i16 = temporary_storage
// CHECK:STDOUT: %addr: %ptr = addr_of %.loc7_37.1
// CHECK:STDOUT: %foo_short__carbon_thunk.call: init %empty_tuple.type = call imports.%foo_short__carbon_thunk.decl(%addr)
// CHECK:STDOUT: %.loc7_30.2: init %i16 to %.loc7_30.1 = mark_in_place_init %foo_short__carbon_thunk.call
// CHECK:STDOUT: %.loc7_10: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %.loc7_37.2: init %i16 to %.loc7_37.1 = mark_in_place_init %foo_short__carbon_thunk.call
// CHECK:STDOUT: %.loc7_17: type = splice_block %i16 [concrete = constants.%i16] {
// CHECK:STDOUT: %int_16: Core.IntLiteral = int_value 16 [concrete = constants.%int_16]
// CHECK:STDOUT: %i16: type = class_type @Int, @Int(constants.%int_16) [concrete = constants.%i16]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc7_30.3: ref %i16 = temporary %.loc7_30.1, %.loc7_30.2
// CHECK:STDOUT: %.loc7_30.4: %i16 = acquire_value %.loc7_30.3
// CHECK:STDOUT: %x: %i16 = value_binding x, %.loc7_30.4
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %.loc7_30.3, constants.%DestroyOp
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%.loc7_30.3)
// CHECK:STDOUT: %.loc7_37.3: ref %i16 = temporary %.loc7_37.1, %.loc7_37.2
// CHECK:STDOUT: %.loc7_37.4: %i16 = acquire_value %.loc7_37.3
// CHECK:STDOUT: %x: %i16 = value_binding x, %.loc7_37.4
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %.loc7_37.3, constants.%DestroyOp
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%.loc7_37.3)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: