Files
carbon-lang/toolchain/check/testdata/interop/cpp/class/import/union.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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/interop/cpp/class/import/union.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/import/union.carbon
// ============================================================================
// Declaration
// ============================================================================
// --- declaration.h
union Bar;
// --- import_declaration.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// --- fail_use_declaration_as_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
fn MyF() {
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE+8]]:19: error: binding pattern has incomplete type `Bar` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: var unused bar: Cpp.Bar;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_use_declaration_as_definition.carbon:[[@LINE-6]]:10: in file included here [InCppInclude]
// CHECK:STDERR: ./declaration.h:2:7: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR: union Bar;
// CHECK:STDERR: ^
// CHECK:STDERR:
var unused bar: Cpp.Bar;
}
// ============================================================================
// Definition
// ============================================================================
// --- definition.h
union Bar {};
// --- import_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Declaration and definition
// ============================================================================
// --- declaration_and_definition.h
union Bar;
union Bar {};
// --- import_declaration_and_definition.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration_and_definition.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// Static member function
// ============================================================================
// --- static_member_function.h
union Bar {
public:
static auto foo() -> void;
};
// --- import_static_member_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_member_function.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.Bar.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Static data member
// ============================================================================
// --- static_data_member.h
union Bar {
public:
static Bar* _Nonnull foo;
};
// --- import_static_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "static_data_member.h";
fn MyF() {
//@dump-sem-ir-begin
let unused bar: Cpp.Bar* = Cpp.Bar.foo;
//@dump-sem-ir-end
}
// ============================================================================
// Data member
// ============================================================================
// --- data_member.h
union Bar {
public:
Bar* _Nonnull foo;
};
// --- import_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "data_member.h";
//@dump-sem-ir-begin
fn MyF(bar : Cpp.Bar*) {
let unused foo_bar: Cpp.Bar* = bar->foo;
}
//@dump-sem-ir-end
// ============================================================================
// Template
// ============================================================================
// --- template.h
struct X {};
template<typename T>
union Bar {};
// --- import_template.carbon
library "[[@TEST_NAME]]";
import Cpp library "template.h";
//@dump-sem-ir-begin
fn MyF(bar: Cpp.Bar(Cpp.X)*);
//@dump-sem-ir-end
// CHECK:STDOUT: --- import_declaration.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete = constants.%bar.param_patt]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete = constants.%bar.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete = constants.%bar.param_patt]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete = constants.%bar.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_declaration_and_definition.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete = constants.%bar.param_patt]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete = constants.%bar.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_member_function.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.type: type = cpp_overload_set_type @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete]
// CHECK:STDOUT: %Bar.foo.type: type = fn_type @Bar.foo [concrete]
// CHECK:STDOUT: %Bar.foo: %Bar.foo.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %Bar.foo.cpp_overload_set.value: %Bar.foo.cpp_overload_set.type = cpp_overload_set_value @Bar.foo.cpp_overload_set [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.decl: %Bar.foo.type = fn_decl @Bar.foo [concrete = constants.%Bar.foo] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: %Bar.foo.cpp_overload_set.type = name_ref foo, imports.%Bar.foo.cpp_overload_set.value [concrete = constants.%Bar.foo.cpp_overload_set.value]
// CHECK:STDOUT: %Bar.foo.call: init %empty_tuple.type = call imports.%Bar.foo.decl()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_static_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.227: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.227 [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete]
// CHECK:STDOUT: %foo.patt: %pattern_type = ref_binding_pattern foo [concrete]
// CHECK:STDOUT: %foo.var_patt: %pattern_type = var_pattern %foo.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: %foo.patt: %pattern_type = ref_binding_pattern foo [concrete = constants.%foo.patt]
// CHECK:STDOUT: %foo.var_patt: %pattern_type = var_pattern %foo.patt [concrete = constants.%foo.var_patt]
// CHECK:STDOUT: %foo.var: ref %ptr.227 = var %foo.var_patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %bar.patt: %pattern_type = value_binding_pattern bar [concrete = constants.%bar.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc8_30: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_33: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: ref %ptr.227 = name_ref foo, imports.%foo.var [concrete = imports.%foo.var]
// CHECK:STDOUT: %.loc8_37: %ptr.227 = acquire_value %foo.ref
// CHECK:STDOUT: %.loc8_26: type = splice_block %ptr [concrete = constants.%ptr.227] {
// CHECK:STDOUT: %Cpp.ref.loc8_19: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8_22: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref.loc8_22 [concrete = constants.%ptr.227]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.227 = value_binding bar, %.loc8_37
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.227: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.227 [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: %foo_bar.patt: %pattern_type = value_binding_pattern foo_bar [concrete]
// CHECK:STDOUT: %Bar.elem: type = unbound_element_type %Bar, %ptr.227 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete = constants.%bar.param_patt]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete = constants.%bar.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr.227 = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr.loc7 [concrete = constants.%ptr.227] {
// CHECK:STDOUT: %Cpp.ref.loc7: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc7: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc7: type = ptr_type %Bar.ref.loc7 [concrete = constants.%ptr.227]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.227 = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr.227) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %foo_bar.patt: %pattern_type = value_binding_pattern foo_bar [concrete = constants.%foo_bar.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar.ref: %ptr.227 = name_ref bar, %bar
// CHECK:STDOUT: %.loc8_37.1: ref %Bar = deref %bar.ref
// CHECK:STDOUT: %foo.ref: %Bar.elem = name_ref foo, @Bar.%.1 [concrete = @Bar.%.1]
// CHECK:STDOUT: %.loc8_37.2: ref %ptr.227 = class_element_access %.loc8_37.1, element0
// CHECK:STDOUT: %.loc8_37.3: %ptr.227 = acquire_value %.loc8_37.2
// CHECK:STDOUT: %.loc8_30: type = splice_block %ptr.loc8 [concrete = constants.%ptr.227] {
// CHECK:STDOUT: %Cpp.ref.loc8: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc8: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc8: type = ptr_type %Bar.ref.loc8 [concrete = constants.%ptr.227]
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo_bar: %ptr.227 = value_binding foo_bar, %.loc8_37.3
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_template.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar.type: type = cpp_type_template_type Bar [concrete]
// CHECK:STDOUT: %Bar.template: %Bar.type = struct_value () [concrete]
// CHECK:STDOUT: %X: type = class_type @X [concrete]
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete]
// CHECK:STDOUT: %MyF.type: type = fn_type @MyF [concrete]
// CHECK:STDOUT: %MyF: %MyF.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Cpp: <namespace> = namespace file.%Cpp.import_cpp, [concrete] {
// CHECK:STDOUT: .Bar = %Bar.template
// CHECK:STDOUT: .X = %X.decl
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Bar.template: %Bar.type = struct_value () [concrete = constants.%Bar.template]
// CHECK:STDOUT: %X.decl: type = class_decl @X [concrete = constants.%X] {} {}
// CHECK:STDOUT: %Bar.decl: type = class_decl @Bar [concrete = constants.%Bar] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern [concrete = constants.%bar.param_patt]
// CHECK:STDOUT: %bar.patt: %pattern_type = at_binding_pattern bar, %bar.param_patt [concrete = constants.%bar.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Cpp.ref.loc7_13: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: %Bar.type = name_ref Bar, imports.%Bar.template [concrete = constants.%Bar.template]
// CHECK:STDOUT: %Cpp.ref.loc7_21: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %X.ref: type = name_ref X, imports.%X.decl [concrete = constants.%X]
// CHECK:STDOUT: %ptr: type = ptr_type imports.%Bar.decl [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr = value_binding bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT: