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carbon-lang/toolchain/check/testdata/class/nested_name.carbon
T
Geoff RomerandRichard Smith e023f75254 Implement thunking in terms of constant evaluation (#7332) 
The bulk of this change is changing most pattern insts to be `Always`
rather than `AlwaysUnique` constants, so that they can be wrapped in
`SpecificConstant`s to perform substitution. That then lets thunking
rely much more on `SpecificConstant` wrappers instead of deep-copying
the inst tree with modified types.

This approach to thunking should scale better, particularly as things
like form generics make function signatures more complex, because we can
leverage the existing support for constant evaluation and substitution.
Unfortunately, applying this approach to binding patterns will require
more work; see the TODO near the top of `thunk.cpp` for details.

---------

Co-authored-by: Richard Smith <richard@metafoo.co.uk>
2026-06-13 00:22:00 +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/int.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/class/nested_name.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/class/nested_name.carbon
class Outer {
class Inner {
var n: i32;
}
}
fn F(oi: Outer.Inner) -> i32 {
return oi.n;
}
fn G(o: Outer) {
var unused i: o.Inner;
}
// CHECK:STDOUT: --- nested_name.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Outer: type = class_type @Outer [concrete]
// CHECK:STDOUT: %Inner: type = class_type @Inner [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %i32.builtin: type = int_type signed, %int_32 [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %Inner.elem: type = unbound_element_type %Inner, %i32 [concrete]
// CHECK:STDOUT: %struct_type.n: type = struct_type {.n: %i32} [concrete]
// CHECK:STDOUT: %complete_type.cdf: <witness> = complete_type_witness %struct_type.n [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type.357: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %pattern_type.dc4: type = pattern_type %Inner [concrete]
// CHECK:STDOUT: %oi.param_patt: %pattern_type.dc4 = value_param_pattern [concrete]
// CHECK:STDOUT: %oi.patt: %pattern_type.dc4 = at_binding_pattern oi, %oi.param_patt [concrete]
// CHECK:STDOUT: %.795: Core.Form = init_form %i32 [concrete]
// CHECK:STDOUT: %return.param_patt.a9a: %pattern_type.6b6 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt.e1b: %pattern_type.6b6 = return_slot_pattern %return.param_patt.a9a, %i32 [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %Copy.type: type = facet_type <@Copy> [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.ac8: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%N) [symbolic]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.5e0: %Int.as.Copy.impl.Op.type.ac8 = struct_value () [symbolic]
// CHECK:STDOUT: %T.67d: type = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %Copy.impl_witness.0e0: <witness> = impl_witness imports.%Copy.impl_witness_table.367, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.type.3f6: type = fn_type @Int.as.Copy.impl.Op, @Int.as.Copy.impl(%int_32) [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.4f6: %Int.as.Copy.impl.Op.type.3f6 = struct_value () [concrete]
// CHECK:STDOUT: %Copy.facet: %Copy.type = facet_value %i32, (%Copy.impl_witness.0e0) [concrete]
// CHECK:STDOUT: %Copy.WithSelf.Op.type.d09: type = fn_type @Copy.WithSelf.Op, @Copy.WithSelf(%Copy.facet) [concrete]
// CHECK:STDOUT: %.7a6: type = fn_type_with_self_type %Copy.WithSelf.Op.type.d09, %Copy.facet [concrete]
// CHECK:STDOUT: %Int.as.Copy.impl.Op.specific_fn: <specific function> = specific_function %Int.as.Copy.impl.Op.4f6, @Int.as.Copy.impl.Op(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.d6c: type = pattern_type %Outer [concrete]
// CHECK:STDOUT: %o.param_patt: %pattern_type.d6c = value_param_pattern [concrete]
// CHECK:STDOUT: %o.patt: %pattern_type.d6c = at_binding_pattern o, %o.param_patt [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %i.patt: %pattern_type.dc4 = ref_binding_pattern i [concrete]
// CHECK:STDOUT: %i.var_patt: %pattern_type.dc4 = var_pattern %i.patt [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.type: type = facet_type <@DefaultOrUnformed> [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.150: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%T.67d) [symbolic]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.53a: %T.as.DefaultOrUnformed.impl.Op.type.150 = struct_value () [symbolic]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness.b1a: <witness> = impl_witness imports.%DefaultOrUnformed.impl_witness_table.374, @T.as.DefaultOrUnformed.impl(%Inner) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.type.dd7: type = fn_type @T.as.DefaultOrUnformed.impl.Op, @T.as.DefaultOrUnformed.impl(%Inner) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.0e7: %T.as.DefaultOrUnformed.impl.Op.type.dd7 = struct_value () [concrete]
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value %Inner, (%DefaultOrUnformed.impl_witness.b1a) [concrete]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function %T.as.DefaultOrUnformed.impl.Op.0e7, @T.as.DefaultOrUnformed.impl.Op(%Inner) [concrete]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %Destroy.Op.type.1d8f74.4: type = fn_type @Destroy.Op.loc26_3.4 [concrete]
// CHECK:STDOUT: %Destroy.Op.1a2547.4: %Destroy.Op.type.1d8f74.4 = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .Copy = %Core.Copy
// CHECK:STDOUT: .DefaultOrUnformed = %Core.DefaultOrUnformed
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.Copy: type = import_ref Core//prelude/parts/copy, Copy, loaded [concrete = constants.%Copy.type]
// CHECK:STDOUT: %Core.import_ref.cd6: @Int.as.Copy.impl.%Int.as.Copy.impl.Op.type (%Int.as.Copy.impl.Op.type.ac8) = import_ref Core//prelude/parts/int, loc{{\d+_\d+}}, loaded [symbolic = @Int.as.Copy.impl.%Int.as.Copy.impl.Op (constants.%Int.as.Copy.impl.Op.5e0)]
// CHECK:STDOUT: %Copy.impl_witness_table.367 = impl_witness_table (%Core.import_ref.cd6), @Int.as.Copy.impl [concrete]
// CHECK:STDOUT: %Core.DefaultOrUnformed: type = import_ref Core//prelude/parts/default, DefaultOrUnformed, loaded [concrete = constants.%DefaultOrUnformed.type]
// CHECK:STDOUT: %Core.import_ref.cc8: @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op.type (%T.as.DefaultOrUnformed.impl.Op.type.150) = import_ref Core//prelude/parts/default, loc{{\d+_\d+}}, loaded [symbolic = @T.as.DefaultOrUnformed.impl.%T.as.DefaultOrUnformed.impl.Op (constants.%T.as.DefaultOrUnformed.impl.Op.53a)]
// CHECK:STDOUT: %DefaultOrUnformed.impl_witness_table.374 = impl_witness_table (%Core.import_ref.cc8), @T.as.DefaultOrUnformed.impl [concrete]
// 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: .Outer = %Outer.decl
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Outer.decl: type = class_decl @Outer [concrete = constants.%Outer] {} {}
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %oi.param_patt: %pattern_type.dc4 = value_param_pattern [concrete = constants.%oi.param_patt]
// CHECK:STDOUT: %oi.patt: %pattern_type.dc4 = at_binding_pattern oi, %oi.param_patt [concrete = constants.%oi.patt]
// CHECK:STDOUT: %return.param_patt: %pattern_type.6b6 = out_param_pattern [concrete = constants.%return.param_patt.a9a]
// CHECK:STDOUT: %return.patt: %pattern_type.6b6 = return_slot_pattern %return.param_patt, %i32 [concrete = constants.%return.patt.e1b]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %.loc21_26: Core.Form = init_form %i32 [concrete = constants.%.795]
// CHECK:STDOUT: %oi.param: %Inner = value_param call_param0
// CHECK:STDOUT: %.loc21_15: type = splice_block %Inner.ref [concrete = constants.%Inner] {
// CHECK:STDOUT: %Outer.ref: type = name_ref Outer, file.%Outer.decl [concrete = constants.%Outer]
// CHECK:STDOUT: %Inner.ref: type = name_ref Inner, @Outer.%Inner.decl [concrete = constants.%Inner]
// CHECK:STDOUT: }
// CHECK:STDOUT: %oi: %Inner = value_binding oi, %oi.param
// CHECK:STDOUT: %return.param: ref %i32 = out_param call_param1
// CHECK:STDOUT: %return: ref %i32 = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %o.param_patt: %pattern_type.d6c = value_param_pattern [concrete = constants.%o.param_patt]
// CHECK:STDOUT: %o.patt: %pattern_type.d6c = at_binding_pattern o, %o.param_patt [concrete = constants.%o.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %o.param: %Outer = value_param call_param0
// CHECK:STDOUT: %Outer.ref: type = name_ref Outer, file.%Outer.decl [concrete = constants.%Outer]
// CHECK:STDOUT: %o: %Outer = value_binding o, %o.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Outer {
// CHECK:STDOUT: %Inner.decl: type = class_decl @Inner [concrete = constants.%Inner] {} {}
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type.357]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Outer
// CHECK:STDOUT: .Inner = %Inner.decl
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Inner {
// CHECK:STDOUT: %.loc17: %Inner.elem = field_decl n, element0 [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%struct_type.n [concrete = constants.%complete_type.cdf]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%Inner
// CHECK:STDOUT: .n = %.loc17
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%oi.param: %Inner) -> out %return.param: %i32 {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %oi.ref: %Inner = name_ref oi, %oi
// CHECK:STDOUT: %n.ref: %Inner.elem = name_ref n, @Inner.%.loc17 [concrete = @Inner.%.loc17]
// CHECK:STDOUT: %.loc22_12.1: ref %i32 = class_element_access %oi.ref, element0
// CHECK:STDOUT: %.loc22_12.2: %i32 = acquire_value %.loc22_12.1
// CHECK:STDOUT: %impl.elem0: %.7a6 = impl_witness_access constants.%Copy.impl_witness.0e0, element0 [concrete = constants.%Int.as.Copy.impl.Op.4f6]
// CHECK:STDOUT: %bound_method.loc22_12.1: <bound method> = bound_method %.loc22_12.2, %impl.elem0
// CHECK:STDOUT: %specific_fn: <specific function> = specific_function %impl.elem0, @Int.as.Copy.impl.Op(constants.%int_32) [concrete = constants.%Int.as.Copy.impl.Op.specific_fn]
// CHECK:STDOUT: %bound_method.loc22_12.2: <bound method> = bound_method %.loc22_12.2, %specific_fn
// CHECK:STDOUT: %Int.as.Copy.impl.Op.call: init %i32 = call %bound_method.loc22_12.2(%.loc22_12.2)
// CHECK:STDOUT: return %Int.as.Copy.impl.Op.call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%o.param: %Outer) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %i.patt: %pattern_type.dc4 = ref_binding_pattern i [concrete = constants.%i.patt]
// CHECK:STDOUT: %i.var_patt: %pattern_type.dc4 = var_pattern %i.patt [concrete = constants.%i.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %i.var: ref %Inner = var %i.var_patt
// CHECK:STDOUT: %DefaultOrUnformed.facet: %DefaultOrUnformed.type = facet_value constants.%Inner, (constants.%DefaultOrUnformed.impl_witness.b1a) [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %.loc26_24.1: %DefaultOrUnformed.type = converted constants.%Inner, %DefaultOrUnformed.facet [concrete = constants.%DefaultOrUnformed.facet]
// CHECK:STDOUT: %as_type: type = facet_access_type %.loc26_24.1 [concrete = constants.%Inner]
// CHECK:STDOUT: %.loc26_24.2: type = converted %.loc26_24.1, %as_type [concrete = constants.%Inner]
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.specific_fn: <specific function> = specific_function constants.%T.as.DefaultOrUnformed.impl.Op.0e7, @T.as.DefaultOrUnformed.impl.Op(constants.%Inner) [concrete = constants.%T.as.DefaultOrUnformed.impl.Op.specific_fn]
// CHECK:STDOUT: %.loc26_3: ref %Inner = splice_block %i.var {}
// CHECK:STDOUT: %T.as.DefaultOrUnformed.impl.Op.call: init %Inner to %.loc26_3 = call %T.as.DefaultOrUnformed.impl.Op.specific_fn()
// CHECK:STDOUT: assign %i.var, %T.as.DefaultOrUnformed.impl.Op.call
// CHECK:STDOUT: %.loc26_18: type = splice_block %Inner.ref [concrete = constants.%Inner] {
// CHECK:STDOUT: %o.ref: %Outer = name_ref o, %o
// CHECK:STDOUT: %Inner.ref: type = name_ref Inner, @Outer.%Inner.decl [concrete = constants.%Inner]
// CHECK:STDOUT: }
// CHECK:STDOUT: %i: ref %Inner = ref_binding i, %i.var
// CHECK:STDOUT: %Destroy.Op.bound: <bound method> = bound_method %i.var, constants.%Destroy.Op.1a2547.4
// CHECK:STDOUT: %Destroy.Op.call: init %empty_tuple.type = call %Destroy.Op.bound(%i.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc26_3.1(%self.param: ref %i32.builtin) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc26_3.2(%self.param: ref %i32) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc26_3.3(%self.param: ref %struct_type.n) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Destroy.Op.loc26_3.4(%self.param: ref %Inner) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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