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1e7b7e53ae1429f2f1497defdb363b8a2e7167fc
carbon-lang/toolchain/lower/testdata/interop/cpp/function_decl.carbon
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Richard SmithandJon Ross-Perkins 1e7b7e53ae C++ interop: support for default arguments. (#6108) 
The general strategy here is to force use of a thunk when we want to use
default arguments, and have Clang generate uses of the default arguments
on its side of the thunk.

To support this, change the key type used in `clang_decls` from being
just a `Decl*` to being a pair of `Decl*` and number of parameters in
the case of function decls. Import distinct `SemIR::Function`s for each
number of parameters that's used, and corresponding distinct thunks.

---------

Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
2025-09-24 01:07:59 +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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/function_decl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/function_decl.carbon
// ============================================================================
// function_decl
// ============================================================================
// --- function_decl.h
void foo();
// --- import_function_decl.carbon
library "[[@TEST_NAME]]";
import Cpp library "function_decl.h";
fn MyF() {
Cpp.foo();
}
// ============================================================================
// inline_function_decl
// ============================================================================
// --- inline_function_decl.h
inline void foo() {}
// --- import_inline_function_decl.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_function_decl.h";
fn MyF() {
Cpp.foo();
}
// ============================================================================
// inline_used_function_decl
// ============================================================================
// --- inline_used_function_decl.h
inline __attribute__((used)) void foo() {}
// --- import_inline_used_function_decl.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_used_function_decl.h";
fn MyF() {
Cpp.foo();
}
// ============================================================================
// multiple_inline_function_decls
// ============================================================================
// --- multiple_inline_function_decls.h
inline void foo1() {}
inline void foo2() {}
inline void foo3() {}
// --- import_multiple_inline_function_decls.carbon
library "[[@TEST_NAME]]";
import Cpp library "multiple_inline_function_decls.h";
fn MyF() {
Cpp.foo1();
Cpp.foo2();
Cpp.foo3();
}
// ============================================================================
// inline_recursive_function_decl
// ============================================================================
// --- inline_recursive_function_decl.h
inline void foo1() {}
inline void foo2() { foo1(); }
// --- todo_import_inline_recursive_function_decl.carbon
library "[[@TEST_NAME]]";
import Cpp library "inline_recursive_function_decl.h";
fn MyF() {
// TODO: This should generate the definition of the inline function `foo1()`.
Cpp.foo2();
}
// ============================================================================
// Default arguments
// ============================================================================
// --- with_default_args.h
void F(int a = 1, int b = 2);
// --- call_with_default_args.carbon
library "[[@TEST_NAME]]";
import Cpp library "with_default_args.h";
fn MyF() {
Cpp.F();
Cpp.F(3);
Cpp.F(3, 4);
}
// CHECK:STDOUT: ; ModuleID = 'import_function_decl.carbon'
// CHECK:STDOUT: source_filename = "import_function_decl.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z3foov(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z3foov()
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "import_function_decl.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'import_inline_function_decl.carbon'
// CHECK:STDOUT: source_filename = "import_inline_function_decl.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z3foov = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z3foov(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z3foov() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline_function_decl.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'import_inline_used_function_decl.carbon'
// CHECK:STDOUT: source_filename = "import_inline_used_function_decl.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z3foov = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: @llvm.compiler.used = appending global [1 x ptr] [ptr @_Z3foov], section "llvm.metadata"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z3foov(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z3foov() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @_Z3foov, { 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "import_inline_used_function_decl.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'import_multiple_inline_function_decls.carbon'
// CHECK:STDOUT: source_filename = "import_multiple_inline_function_decls.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z4foo1v = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z4foo2v = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z4foo3v = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z4foo1v(), !dbg !10
// CHECK:STDOUT: call void @_Z4foo2v(), !dbg !11
// CHECK:STDOUT: call void @_Z4foo3v(), !dbg !12
// CHECK:STDOUT: ret void, !dbg !13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo1v() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo2v() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline nounwind optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo3v() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline nounwind optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "import_multiple_inline_function_decls.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 3, scope: !7)
// CHECK:STDOUT: !13 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'todo_import_inline_recursive_function_decl.carbon'
// CHECK:STDOUT: source_filename = "todo_import_inline_recursive_function_decl.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: $_Z4foo2v = comdat any
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z4foo2v(), !dbg !10
// CHECK:STDOUT: ret void, !dbg !11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: mustprogress noinline optnone
// CHECK:STDOUT: define linkonce_odr dso_local void @_Z4foo2v() #0 comdat {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z4foo1v()
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z4foo1v() #1
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { mustprogress noinline optnone "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "todo_import_inline_recursive_function_decl.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 8, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 6, column: 1, scope: !7)
// CHECK:STDOUT: ; ModuleID = 'call_with_default_args.carbon'
// CHECK:STDOUT: source_filename = "call_with_default_args.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: define void @_CMyF.Main() !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z1Fii.carbon_thunk0(), !dbg !10
// CHECK:STDOUT: call void @_Z1Fii.carbon_thunk1(i32 3), !dbg !11
// CHECK:STDOUT: call void @_Z1Fii(i32 3, i32 4), !dbg !12
// CHECK:STDOUT: ret void, !dbg !13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z1Fii(i32, i32)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_Z1Fii.carbon_thunk0() #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z1Fii(i32 1, i32 2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_Z1Fii.carbon_thunk1(i32 %a) #0 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.addr = alloca i32, align 4
// CHECK:STDOUT: store i32 %a, ptr %a.addr, align 4
// CHECK:STDOUT: %0 = load i32, ptr %a.addr, align 4
// CHECK:STDOUT: call void @_Z1Fii(i32 %0, i32 2)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "call_with_default_args.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "MyF", linkageName: "_CMyF.Main", scope: null, file: !6, line: 6, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{}
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 3, scope: !7)
// CHECK:STDOUT: !11 = !DILocation(line: 8, column: 3, scope: !7)
// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 3, scope: !7)
// CHECK:STDOUT: !13 = !DILocation(line: 6, column: 1, scope: !7)
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