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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/function/generic/resolve_used.carbon
Vendored
+14 -14
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@@ -24,10 +24,10 @@ fn ErrorIfNIsZero(N:! Core.IntLiteral()) {
// CHECK:STDERR: min_prelude/parts/int.carbon:11:9: error: integer type width of 0 is not positive [IntWidthNotPositive]
// CHECK:STDERR: adapt MakeInt(N);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+3]]:10: note: in `i0` used here [ResolvingSpecificHere]
// CHECK:STDERR: var v: Core.Int(N);
// CHECK:STDERR: ^~~~~~~~~~~
var v: Core.Int(N);
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+3]]:17: note: in `i0` used here [ResolvingSpecificHere]
// CHECK:STDERR: var unused v: Core.Int(N);
// CHECK:STDERR: ^~~~~~~~~~~
var unused v: Core.Int(N);
}
fn CallNegative() {
@@ -117,11 +117,11 @@ fn CallNegative() {
// CHECK:STDOUT: %N.loc4_19.1: Core.IntLiteral = symbolic_binding N, 0 [symbolic = %N.loc4_19.1 (constants.%N)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc15_20.2: type = class_type @Int, @Int(%N.loc4_19.1) [symbolic = %Int.loc15_20.2 (constants.%Int)]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %Int.loc15_20.2 [symbolic = %require_complete (constants.%require_complete.901)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Int.loc15_20.2 [symbolic = %pattern_type (constants.%pattern_type.764)]
// CHECK:STDOUT: %Destroy.lookup_impl_witness: <witness> = lookup_impl_witness %Int.loc15_20.2, @Destroy [symbolic = %Destroy.lookup_impl_witness (constants.%Destroy.lookup_impl_witness)]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %Int.loc15_20.2, (%Destroy.lookup_impl_witness) [symbolic = %Destroy.facet (constants.%Destroy.facet.1c0)]
// CHECK:STDOUT: %Int.loc15_27.2: type = class_type @Int, @Int(%N.loc4_19.1) [symbolic = %Int.loc15_27.2 (constants.%Int)]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %Int.loc15_27.2 [symbolic = %require_complete (constants.%require_complete.901)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Int.loc15_27.2 [symbolic = %pattern_type (constants.%pattern_type.764)]
// CHECK:STDOUT: %Destroy.lookup_impl_witness: <witness> = lookup_impl_witness %Int.loc15_27.2, @Destroy [symbolic = %Destroy.lookup_impl_witness (constants.%Destroy.lookup_impl_witness)]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %Int.loc15_27.2, (%Destroy.lookup_impl_witness) [symbolic = %Destroy.facet (constants.%Destroy.facet.1c0)]
// CHECK:STDOUT: %Destroy.WithSelf.Op.type: type = fn_type @Destroy.WithSelf.Op, @Destroy(%Destroy.facet) [symbolic = %Destroy.WithSelf.Op.type (constants.%Destroy.WithSelf.Op.type.297)]
// CHECK:STDOUT: %.loc15_3: type = fn_type_with_self_type %Destroy.WithSelf.Op.type, %Destroy.facet [symbolic = %.loc15_3 (constants.%.e63)]
// CHECK:STDOUT: %impl.elem0.loc15_3.2: @ErrorIfNIsZero.%.loc15_3 (%.e63) = impl_witness_access %Destroy.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc15_3.2 (constants.%impl.elem0)]
@@ -133,14 +133,14 @@ fn CallNegative() {
// CHECK:STDOUT: %v.patt: @ErrorIfNIsZero.%pattern_type (%pattern_type.764) = ref_binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: @ErrorIfNIsZero.%pattern_type (%pattern_type.764) = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref @ErrorIfNIsZero.%Int.loc15_20.2 (%Int) = var %v.var_patt
// CHECK:STDOUT: %.loc15_20: type = splice_block %Int.loc15_20.1 [symbolic = %Int.loc15_20.2 (constants.%Int)] {
// CHECK:STDOUT: %v.var: ref @ErrorIfNIsZero.%Int.loc15_27.2 (%Int) = var %v.var_patt
// CHECK:STDOUT: %.loc15_27: type = splice_block %Int.loc15_27.1 [symbolic = %Int.loc15_27.2 (constants.%Int)] {
// CHECK:STDOUT: %Core.ref.loc15: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %Int.ref: %Int.type = name_ref Int, imports.%Core.Int [concrete = constants.%Int.generic]
// CHECK:STDOUT: %N.ref: Core.IntLiteral = name_ref N, %N.loc4_19.2 [symbolic = %N.loc4_19.1 (constants.%N)]
// CHECK:STDOUT: %Int.loc15_20.1: type = class_type @Int, @Int(constants.%N) [symbolic = %Int.loc15_20.2 (constants.%Int)]
// CHECK:STDOUT: %Int.loc15_27.1: type = class_type @Int, @Int(constants.%N) [symbolic = %Int.loc15_27.2 (constants.%Int)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref @ErrorIfNIsZero.%Int.loc15_20.2 (%Int) = ref_binding v, %v.var
// CHECK:STDOUT: %v: ref @ErrorIfNIsZero.%Int.loc15_27.2 (%Int) = ref_binding v, %v.var
// CHECK:STDOUT: %impl.elem0.loc15_3.1: @ErrorIfNIsZero.%.loc15_3 (%.e63) = impl_witness_access constants.%Destroy.lookup_impl_witness, element0 [symbolic = %impl.elem0.loc15_3.2 (constants.%impl.elem0)]
// CHECK:STDOUT: %bound_method.loc15_3.1: <bound method> = bound_method %v.var, %impl.elem0.loc15_3.1
// CHECK:STDOUT: %specific_impl_fn.loc15_3.1: <specific function> = specific_impl_function %impl.elem0.loc15_3.1, @Destroy.WithSelf.Op(constants.%Destroy.facet.1c0) [symbolic = %specific_impl_fn.loc15_3.2 (constants.%specific_impl_fn)]
@@ -169,7 +169,7 @@ fn CallNegative() {
// CHECK:STDOUT: %N.loc4_19.1 => constants.%int_0
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc15_20.2 => constants.%i0
// CHECK:STDOUT: %Int.loc15_27.2 => constants.%i0
// CHECK:STDOUT: %require_complete => constants.%complete_type.d94
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.47b
// CHECK:STDOUT: %Destroy.lookup_impl_witness => constants.%custom_witness.809