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carbon-lang/toolchain/check/testdata/interface/default_fn.carbon
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Burak EmirBurak Emirjonmeow
 fdb188ccfd Implement unused pattern bindings, continued (#6518) 
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>
2026-02-19 23:33:36 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interface/default_fn.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/default_fn.carbon
class C {
interface I {
// TODO: Use `default` here.
fn F[unused self: Self]() {
// I and F are both complete here, and the impl below is in scope.
var c: C = {};
c.(I.F)();
}
}
impl C as I {
fn F[unused self: Self]() {}
}
}
// CHECK:STDOUT: --- default_fn.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self.849: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.binding.as_type.5c6: type = symbolic_binding_type Self, 0, %Self.849 [symbolic]
// CHECK:STDOUT: %pattern_type.b59: type = pattern_type %Self.binding.as_type.5c6 [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.type.b26: type = fn_type @I.WithSelf.F, @I(%Self.849) [symbolic]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %I.WithSelf.F.983: %I.WithSelf.F.type.b26 = struct_value () [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0.1f8: %I.assoc_type = assoc_entity element0, @I.%I.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %pattern_type.7c7: type = pattern_type %C [concrete]
// CHECK:STDOUT: %C.as.I.impl.F.type: type = fn_type @C.as.I.impl.F [concrete]
// CHECK:STDOUT: %C.as.I.impl.F: %C.as.I.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.1f2: type = fn_type @I.WithSelf.F, @I(%I.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.860: %I.WithSelf.F.type.1f2 = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %Self.binding.as_type.5c6 [symbolic]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %C.val: %C = struct_value () [concrete]
// CHECK:STDOUT: %.fae: type = fn_type_with_self_type %I.WithSelf.F.type.1f2, %I.facet [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %DestroyOp.type: type = fn_type @DestroyOp [concrete]
// CHECK:STDOUT: %DestroyOp: %DestroyOp.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self.loc16: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self.849]
// CHECK:STDOUT: interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %I.WithSelf.F.decl: @I.%I.WithSelf.F.type (%I.WithSelf.F.type.b26) = fn_decl @I.WithSelf.F [symbolic = @I.%I.WithSelf.F (constants.%I.WithSelf.F.983)] {
// CHECK:STDOUT: %self.patt: @I.WithSelf.F.%pattern_type (%pattern_type.b59) = value_binding_pattern self [concrete]
// CHECK:STDOUT: %self.param_patt: @I.WithSelf.F.%pattern_type (%pattern_type.b59) = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @I.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type.5c6) = value_param call_param0
// CHECK:STDOUT: %.loc18_23.1: type = splice_block %.loc18_23.2 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self.loc16 [symbolic = %Self (constants.%Self.849)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: %.loc18_23.2: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @I.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type.5c6) = value_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.WithSelf.F.decl [concrete = constants.%assoc0.1f8]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc16
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: .I = <poisoned>
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: .I = <poisoned>
// CHECK:STDOUT: witness = (%I.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: %C.ref as %I.ref {
// CHECK:STDOUT: %C.as.I.impl.F.decl: %C.as.I.impl.F.type = fn_decl @C.as.I.impl.F [concrete = constants.%C.as.I.impl.F] {
// CHECK:STDOUT: %self.patt: %pattern_type.7c7 = value_binding_pattern self [concrete]
// CHECK:STDOUT: %self.param_patt: %pattern_type.7c7 = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: %C = value_param call_param0
// CHECK:STDOUT: %Self.ref: type = name_ref Self, @C.as.I.impl.%C.ref [concrete = constants.%C]
// CHECK:STDOUT: %self: %C = value_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%C.as.I.impl.F.decl), @C.as.I.impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %C.as.I.impl.F.decl
// CHECK:STDOUT: witness = %I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: impl_decl @C.as.I.impl [concrete] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, @C.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .C = <poisoned>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(@I.%Self.loc16: %I.type) {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.849)]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type.5c6)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.binding.as_type [symbolic = %pattern_type (constants.%pattern_type.b59)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %Self.binding.as_type [symbolic = %require_complete (constants.%require_complete)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @I.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type.5c6)) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %c.patt: %pattern_type.7c7 = ref_binding_pattern c [concrete]
// CHECK:STDOUT: %c.var_patt: %pattern_type.7c7 = var_pattern %c.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %c.var: ref %C = var %c.var_patt
// CHECK:STDOUT: %.loc20_19.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc20_19.2: init %C to %c.var = class_init () [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc20_7: init %C = converted %.loc20_19.1, %.loc20_19.2 [concrete = constants.%C.val]
// CHECK:STDOUT: assign %c.var, %.loc20_7
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: ref %C = ref_binding c, %c.var
// CHECK:STDOUT: %c.ref: ref %C = name_ref c, %c
// CHECK:STDOUT: %I.ref: type = name_ref I, @C.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: %F.ref: %I.assoc_type = name_ref F, @I.%assoc0 [concrete = constants.%assoc0.1f8]
// CHECK:STDOUT: %impl.elem0: %.fae = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.F]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %.loc21: %C = acquire_value %c.ref
// CHECK:STDOUT: %C.as.I.impl.F.call: init %empty_tuple.type = call %bound_method(%.loc21)
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %c.var, constants.%DestroyOp
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%c.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.I.impl.F(%self.param: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @DestroyOp(%self.param: ref %C) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%Self.849) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc18 => constants.%Self.849
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.b26
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.983
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self.849) {
// CHECK:STDOUT: %Self => constants.%Self.849
// CHECK:STDOUT: %Self.binding.as_type => constants.%Self.binding.as_type.5c6
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.b59
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%I.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc18 => constants.%I.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.1f2
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.860
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%I.facet) {
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %Self.binding.as_type => constants.%C
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.7c7
// CHECK:STDOUT: }
// CHECK:STDOUT:
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