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carbon-lang/toolchain/check/testdata/interop/cpp/class/union.carbon
T
Jon Ross-Perkins 7ccc1e0144 Expand naming for impls and functions (#5808) 
Change impls from `<interface>.impl` to `<self>.as.<interface>.impl`,
and *member* functions to `<parent scope>.<fn>` (non-member functions
exclude their parent scope). Stop special-casing builtin functions,
given the new naming scheme.

The purpose of this is to make it clearer when a member function is
being accessed and, if so, which member function. In particular, we
often access interface `Op` functions. The builtin function
special-casing was intended to help with that, but we still have lots of
`Op` functions. This particular approach should make the interactions
clearer.

This changes up queueing of block IDs a little because, in particular,
we need to process bodies of entities only after constants finish
processing. But, it should also result in less memory usage during
processing because it means we have less on the insts stack at any given
time, since we track a block rather than all instructions contained by
the block.
2025-07-21 18:45:07 +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/none.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/union.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interop/cpp/class/union.carbon
// ============================================================================
// Declaration
// ============================================================================
// --- declaration.h
union Bar;
// --- fail_todo_import_declaration.carbon
library "[[@TEST_NAME]]";
import Cpp library "declaration.h";
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_declaration.carbon:[[@LINE+7]]:13: error: semantics TODO: `Unsupported: Record declarations without a definition` [SemanticsTodo]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_todo_import_declaration.carbon:[[@LINE+4]]:13: note: in `Cpp` name lookup for `Bar` [InCppNameLookup]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// ============================================================================
// 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
// ============================================================================
// Public static member function
// ============================================================================
// --- public_static_member_function.h
union Bar {
public:
static auto foo() -> void;
};
// --- import_public_static_member_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "public_static_member_function.h";
fn MyF() {
//@dump-sem-ir-begin
Cpp.Bar.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Private static member function
// ============================================================================
// --- private_static_member_function.h
union Bar {
private:
static auto foo() -> void;
};
// --- todo_fail_import_private_static_member_function.carbon
library "[[@TEST_NAME]]";
import Cpp library "private_static_member_function.h";
fn MyF() {
Cpp.Bar.foo();
}
// ============================================================================
// Public static data member
// ============================================================================
// --- public_static_data_member.h
union Bar {
public:
static Bar* foo;
};
// --- fail_todo_import_public_static_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "public_static_data_member.h";
fn MyF() {
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_public_static_data_member.carbon:[[@LINE+11]]:23: error: semantics TODO: `Unsupported: Declaration type Var` [SemanticsTodo]
// CHECK:STDERR: let bar: Cpp.Bar* = Cpp.Bar.foo();
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR: fail_todo_import_public_static_data_member.carbon:[[@LINE+8]]:23: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
// CHECK:STDERR: let bar: Cpp.Bar* = Cpp.Bar.foo();
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_public_static_data_member.carbon:[[@LINE+4]]:23: error: member name `foo` not found in `Cpp.Bar` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: let bar: Cpp.Bar* = Cpp.Bar.foo();
// CHECK:STDERR: ^~~~~~~~~~~
// CHECK:STDERR:
let bar: Cpp.Bar* = Cpp.Bar.foo();
//@dump-sem-ir-end
}
// ============================================================================
// Public data member
// ============================================================================
// --- public_data_member.h
union Bar {
public:
Bar* foo;
};
// --- fail_todo_import_public_data_member.carbon
library "[[@TEST_NAME]]";
import Cpp library "public_static_data_member.h";
//@dump-sem-ir-begin
fn MyF(bar : Cpp.Bar*) {
// CHECK:STDERR: fail_todo_import_public_data_member.carbon:[[@LINE+11]]:27: error: semantics TODO: `Unsupported: Declaration type Var` [SemanticsTodo]
// CHECK:STDERR: let foo_bar: Cpp.Bar* = bar->foo;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_todo_import_public_data_member.carbon:[[@LINE+8]]:27: note: in `Cpp` name lookup for `foo` [InCppNameLookup]
// CHECK:STDERR: let foo_bar: Cpp.Bar* = bar->foo;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_public_data_member.carbon:[[@LINE+4]]:27: error: member name `foo` not found in `Cpp.Bar` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: let foo_bar: Cpp.Bar* = bar->foo;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
let foo_bar: Cpp.Bar* = bar->foo;
}
//@dump-sem-ir-end
// ============================================================================
// To inherit public
// ============================================================================
// --- to_inherit_public.h
union Bar {
public:
static auto foo() -> void;
};
// --- todo_fail_import_to_inherit_public.carbon
library "[[@TEST_NAME]]";
import Cpp library "to_inherit_public.h";
class Derived {
extend base: Cpp.Bar;
}
fn MyF() {
Derived.foo();
}
// ============================================================================
// Template
// ============================================================================
// --- template.h
template<typename T>
union Bar {};
// --- fail_todo_import_template.carbon
library "[[@TEST_NAME]]";
import Cpp library "template.h";
//@dump-sem-ir-begin
// CHECK:STDERR: fail_todo_import_template.carbon:[[@LINE+11]]:13: error: semantics TODO: `Unsupported: Declaration type ClassTemplate` [SemanticsTodo]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_todo_import_template.carbon:[[@LINE+8]]:13: note: in `Cpp` name lookup for `Bar` [InCppNameLookup]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_import_template.carbon:[[@LINE+4]]:13: error: member name `Bar` not found in `Cpp` [MemberNameNotFoundInInstScope]
// CHECK:STDERR: fn MyF(bar: Cpp.Bar*);
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
fn MyF(bar: Cpp.Bar*);
//@dump-sem-ir-end
// CHECK:STDOUT: --- fail_todo_import_declaration.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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 = <error>
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: <error> = binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: <error> = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: <error> = value_param call_param0
// CHECK:STDOUT: %.loc14: type = splice_block %ptr [concrete = <error>] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: <error> = name_ref Bar, <error> [concrete = <error>]
// CHECK:STDOUT: %ptr: type = ptr_type <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: <error> = bind_name bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: <error>);
// 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: %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.patt: %pattern_type = binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// 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: <elided>
// 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 = bind_name 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: %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.patt: %pattern_type = binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// 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: <elided>
// 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 = bind_name bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr);
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_public_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.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.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: <elided>
// CHECK:STDOUT: %Bar.ref: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: %Bar.foo.type = name_ref foo, imports.%Bar.foo.decl [concrete = constants.%Bar.foo]
// CHECK:STDOUT: %Bar.foo.call: init %empty_tuple.type = call %foo.ref()
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_public_static_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.f68: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.f68 [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: fn @MyF() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %bar.patt: %pattern_type = binding_pattern bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %Cpp.ref.loc19_23: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc19_26: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: %.loc19: type = splice_block %ptr [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc19_12: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %Bar.ref.loc19_15: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr: type = ptr_type %Bar.ref.loc19_15 [concrete = constants.%ptr.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.f68 = bind_name bar, <error> [concrete = <error>]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_public_data_member.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Bar: type = class_type @Bar [concrete]
// CHECK:STDOUT: %ptr.f68: type = ptr_type %Bar [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr.f68 [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.patt: %pattern_type = binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: %pattern_type = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: %ptr.f68 = value_param call_param0
// CHECK:STDOUT: %.loc7: type = splice_block %ptr.loc7 [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc7: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: <elided>
// 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.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: %ptr.f68 = bind_name bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: %ptr.f68) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %foo_bar.patt: %pattern_type = binding_pattern foo_bar [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar.ref: %ptr.f68 = name_ref bar, %bar
// CHECK:STDOUT: %.loc19_30: ref %Bar = deref %bar.ref
// CHECK:STDOUT: %foo.ref: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: %.loc19_23: type = splice_block %ptr.loc19 [concrete = constants.%ptr.f68] {
// CHECK:STDOUT: %Cpp.ref.loc19: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref.loc19: type = name_ref Bar, imports.%Bar.decl [concrete = constants.%Bar]
// CHECK:STDOUT: %ptr.loc19: type = ptr_type %Bar.ref.loc19 [concrete = constants.%ptr.f68]
// CHECK:STDOUT: }
// CHECK:STDOUT: %foo_bar: %ptr.f68 = bind_name foo_bar, <error> [concrete = <error>]
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_import_template.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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 = <poisoned>
// CHECK:STDOUT: import Cpp//...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %MyF.decl: %MyF.type = fn_decl @MyF [concrete = constants.%MyF] {
// CHECK:STDOUT: %bar.patt: <error> = binding_pattern bar [concrete]
// CHECK:STDOUT: %bar.param_patt: <error> = value_param_pattern %bar.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %bar.param: <error> = value_param call_param0
// CHECK:STDOUT: %.loc18: type = splice_block %ptr [concrete = <error>] {
// CHECK:STDOUT: %Cpp.ref: <namespace> = name_ref Cpp, imports.%Cpp [concrete = imports.%Cpp]
// CHECK:STDOUT: %Bar.ref: <error> = name_ref Bar, <error> [concrete = <error>]
// CHECK:STDOUT: %ptr: type = ptr_type <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %bar: <error> = bind_name bar, %bar.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @MyF(%bar.param: <error>);
// CHECK:STDOUT:
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