hikari-no-yume
commented
3 years ago I had the exact same experience yesterday, now that the issues with zero-sized types and missing function pointer types are fixed. I strongly suspect this is not the fault of the C backend, though. The Rust code is most likely referencing external symbols that need to be linked in, and obviously a C compiler doesn't link the Rust standard library by default.
I intend to experiment with this when I have some free time. It's hopefully as simple as adding a -l argument to the C compiler's invocation.
XAMPPRocky
Consider the following Rust code:
This can be compiled using the following.
cargo new --lib cbe-testsrc/lib.rscargo rustc -- --emit llvm-irtarget/debug/depsfolder there should be ancbe-test.llor similar file.llvm-cbe ./cbe-test.ll -o cbe-test.cclang cbe-test.cYou get the following error.
LLVM IR
``` ; ModuleID = '2cwjgb4q3tsf1uv9' source_filename = "2cwjgb4q3tsf1uv9" target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-apple-macosx10.7.0" %"std::fmt::Arguments" = type { [0 x i64], { [0 x { [0 x i8]*, i64 }]*, i64 }, [0 x i64], { i64*, i64 }, [0 x i64], { [0 x { i8*, i64* }]*, i64 }, [0 x i64] } %"unwind::libunwind::_Unwind_Exception" = type { [0 x i64], i64, [0 x i64], void (i32, %"unwind::libunwind::_Unwind_Exception"*)*, [0 x i64], [6 x i64], [0 x i64] } %"unwind::libunwind::_Unwind_Context" = type { [0 x i8] } @vtable.0 = private unnamed_addr constant { void (i64**)*, i64, i64, i32 (i64**)*, i32 (i64**)*, i32 (i64**)* } { void (i64**)* @"_ZN4core3ptr85drop_in_place$LT$std..rt..lang_start$LT$$LP$$RP$$GT$..$u7b$$u7b$closure$u7d$$u7d$$GT$17h1f2c731336d07166E", i64 8, i64 8, i32 (i64**)* @"_ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17he0db835a6152dd3dE", i32 (i64**)* @"_ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17he0db835a6152dd3dE", i32 (i64**)* @"_ZN4core3ops8function6FnOnce40call_once$u7b$$u7b$vtable.shim$u7d$$u7d$17h07a3d3e0729b96baE" }, align 8, !dbg !0 @alloc1 = private unnamed_addr constant <{ [13 x i8] }> <{ [13 x i8] c"Hello World!\0A" }>, align 1 @alloc2 = private unnamed_addr constant <{ i8*, [8 x i8] }> <{ i8* getelementptr inbounds (<{ [13 x i8] }>, <{ [13 x i8] }>* @alloc1, i32 0, i32 0, i32 0), [8 x i8] c"\0D\00\00\00\00\00\00\00" }>, align 8 @alloc4 = private unnamed_addr constant <{ [0 x i8] }> zeroinitializer, align 8 ; std::sys_common::backtrace::__rust_begin_short_backtrace ; Function Attrs: noinline uwtable define internal void @_ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17hdab553cbc2abb651E(void ()* nonnull %f) unnamed_addr #0 personality i32 (i32, i32, i64, %"unwind::libunwind::_Unwind_Exception"*, %"unwind::libunwind::_Unwind_Context"*)* @rust_eh_personality !dbg !38 { start: %0 = alloca { i8*, i32 }, align 8 %f.dbg.spill = alloca void ()*, align 8 %result.dbg.spill = alloca {}, align 1 %_5 = alloca {}, align 1 %_3 = alloca {}, align 1 call void @llvm.dbg.declare(metadata {}* %result.dbg.spill, metadata !46, metadata !DIExpression()), !dbg !52 store void ()* %f, void ()** %f.dbg.spill, align 8 call void @llvm.dbg.declare(metadata void ()** %f.dbg.spill, metadata !45, metadata !DIExpression()), !dbg !53 ; call core::ops::function::FnOnce::call_once call void @_ZN4core3ops8function6FnOnce9call_once17h21a5088bccbb7ceeE(void ()* nonnull %f), !dbg !54 br label %bb1, !dbg !54 bb1: ; preds = %start ; invoke core::hint::black_box invoke void @_ZN4core4hint9black_box17hfabbc7664b85073eE() to label %bb2 unwind label %cleanup, !dbg !55 bb2: ; preds = %bb1 ret void, !dbg !56 bb3: ; preds = %cleanup br label %bb4, !dbg !57 bb4: ; preds = %bb3 %1 = bitcast { i8*, i32 }* %0 to i8**, !dbg !58 %2 = load i8*, i8** %1, align 8, !dbg !58 %3 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %0, i32 0, i32 1, !dbg !58 %4 = load i32, i32* %3, align 8, !dbg !58 %5 = insertvalue { i8*, i32 } undef, i8* %2, 0, !dbg !58 %6 = insertvalue { i8*, i32 } %5, i32 %4, 1, !dbg !58 resume { i8*, i32 } %6, !dbg !58 cleanup: ; preds = %bb1 %7 = landingpad { i8*, i32 } cleanup %8 = extractvalue { i8*, i32 } %7, 0 %9 = extractvalue { i8*, i32 } %7, 1 %10 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %0, i32 0, i32 0 store i8* %8, i8** %10, align 8 %11 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %0, i32 0, i32 1 store i32 %9, i32* %11, align 8 br label %bb3 } ; std::rt::lang_start ; Function Attrs: uwtable define hidden i64 @_ZN3std2rt10lang_start17h3d503a6b6a81c10bE(void ()* nonnull %main, i64 %argc, i8** %argv) unnamed_addr #1 !dbg !59 { start: %argv.dbg.spill = alloca i8**, align 8 %argc.dbg.spill = alloca i64, align 8 %main.dbg.spill = alloca void ()*, align 8 %_7 = alloca i64*, align 8 store void ()* %main, void ()** %main.dbg.spill, align 8 call void @llvm.dbg.declare(metadata void ()** %main.dbg.spill, metadata !67, metadata !DIExpression()), !dbg !71 store i64 %argc, i64* %argc.dbg.spill, align 8 call void @llvm.dbg.declare(metadata i64* %argc.dbg.spill, metadata !68, metadata !DIExpression()), !dbg !72 store i8** %argv, i8*** %argv.dbg.spill, align 8 call void @llvm.dbg.declare(metadata i8*** %argv.dbg.spill, metadata !69, metadata !DIExpression()), !dbg !73 %0 = bitcast i64** %_7 to void ()**, !dbg !74 store void ()* %main, void ()** %0, align 8, !dbg !74 %_4.0 = bitcast i64** %_7 to {}*, !dbg !75 ; call std::rt::lang_start_internal %1 = call i64 @_ZN3std2rt19lang_start_internal17h86f505dc7de50d93E({}* nonnull align 1 %_4.0, [3 x i64]* noalias readonly align 8 dereferenceable(24) bitcast ({ void (i64**)*, i64, i64, i32 (i64**)*, i32 (i64**)*, i32 (i64**)* }* @vtable.0 to [3 x i64]*), i64 %argc, i8** %argv), !dbg !76 br label %bb1, !dbg !76 bb1: ; preds = %start ret i64 %1, !dbg !77 } ; std::rt::lang_start::{{closure}} ; Function Attrs: inlinehint uwtable define internal i32 @"_ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17he0db835a6152dd3dE"(i64** noalias readonly align 8 dereferenceable(8) %_1) unnamed_addr #2 !dbg !78 { start: %_1.dbg.spill = alloca i64**, align 8 store i64** %_1, i64*** %_1.dbg.spill, align 8 call void @llvm.dbg.declare(metadata i64*** %_1.dbg.spill, metadata !84, metadata !DIExpression(DW_OP_deref)), !dbg !85 %0 = bitcast i64** %_1 to void ()**, !dbg !86 %_3 = load void ()*, void ()** %0, align 8, !dbg !86, !nonnull !4 ; call std::sys_common::backtrace::__rust_begin_short_backtrace call void @_ZN3std10sys_common9backtrace28__rust_begin_short_backtrace17hdab553cbc2abb651E(void ()* nonnull %_3), !dbg !87 br label %bb1, !dbg !87 bb1: ; preds = %start ; call <() as std::process::Termination>::report %1 = call i32 @"_ZN54_$LT$$LP$$RP$$u20$as$u20$std..process..Termination$GT$6report17h381b611d03f4782aE"(), !dbg !87 br label %bb2, !dbg !87 bb2: ; preds = %bb1 ret i32 %1, !dbg !88 } ; std::sys::unix::process::process_common::ExitCode::as_i32 ; Function Attrs: inlinehint uwtable define internal i32 @_ZN3std3sys4unix7process14process_common8ExitCode6as_i3217he414c8ec5ab83350E(i8* noalias readonly align 1 dereferenceable(1) %self) unnamed_addr #2 !dbg !89 { start: %self.dbg.spill = alloca i8*, align 8 store i8* %self, i8** %self.dbg.spill, align 8 call void @llvm.dbg.declare(metadata i8** %self.dbg.spill, metadata !102, metadata !DIExpression()), !dbg !103 %_2 = load i8, i8* %self, align 1, !dbg !104 %0 = zext i8 %_2 to i32, !dbg !104 ret i32 %0, !dbg !105 } ; core::fmt::Arguments::new_v1 ; Function Attrs: inlinehint uwtable define internal void @_ZN4core3fmt9Arguments6new_v117h13e4f70e15a317eeE(%"std::fmt::Arguments"* noalias nocapture sret dereferenceable(48) %0, [0 x { [0 x i8]*, i64 }]* noalias nonnull readonly align 8 %pieces.0, i64 %pieces.1, [0 x { i8*, i64* }]* noalias nonnull readonly align 8 %args.0, i64 %args.1) unnamed_addr #2 !dbg !106 { start: %args.dbg.spill = alloca { [0 x { i8*, i64* }]*, i64 }, align 8 %pieces.dbg.spill = alloca { [0 x { [0 x i8]*, i64 }]*, i64 }, align 8 %_4 = alloca { i64*, i64 }, align 8 %1 = getelementptr inbounds { [0 x { [0 x i8]*, i64 }]*, i64 }, { [0 x { [0 x i8]*, i64 }]*, i64 }* %pieces.dbg.spill, i32 0, i32 0 store [0 x { [0 x i8]*, i64 }]* %pieces.0, [0 x { [0 x i8]*, i64 }]** %1, align 8 %2 = getelementptr inbounds { [0 x { [0 x i8]*, i64 }]*, i64 }, { [0 x { [0 x i8]*, i64 }]*, i64 }* %pieces.dbg.spill, i32 0, i32 1 store i64 %pieces.1, i64* %2, align 8 call void @llvm.dbg.declare(metadata { [0 x { [0 x i8]*, i64 }]*, i64 }* %pieces.dbg.spill, metadata !218, metadata !DIExpression()), !dbg !220 %3 = getelementptr inbounds { [0 x { i8*, i64* }]*, i64 }, { [0 x { i8*, i64* }]*, i64 }* %args.dbg.spill, i32 0, i32 0 store [0 x { i8*, i64* }]* %args.0, [0 x { i8*, i64* }]** %3, align 8 %4 = getelementptr inbounds { [0 x { i8*, i64* }]*, i64 }, { [0 x { i8*, i64* }]*, i64 }* %args.dbg.spill, i32 0, i32 1 store i64 %args.1, i64* %4, align 8 call void @llvm.dbg.declare(metadata { [0 x { i8*, i64* }]*, i64 }* %args.dbg.spill, metadata !219, metadata !DIExpression()), !dbg !221 %5 = bitcast { i64*, i64 }* %_4 to {}**, !dbg !222 store {}* null, {}** %5, align 8, !dbg !222 %6 = bitcast %"std::fmt::Arguments"* %0 to { [0 x { [0 x i8]*, i64 }]*, i64 }*, !dbg !223 %7 = getelementptr inbounds { [0 x { [0 x i8]*, i64 }]*, i64 }, { [0 x { [0 x i8]*, i64 }]*, i64 }* %6, i32 0, i32 0, !dbg !223 store [0 x { [0 x i8]*, i64 }]* %pieces.0, [0 x { [0 x i8]*, i64 }]** %7, align 8, !dbg !223 %8 = getelementptr inbounds { [0 x { [0 x i8]*, i64 }]*, i64 }, { [0 x { [0 x i8]*, i64 }]*, i64 }* %6, i32 0, i32 1, !dbg !223 store i64 %pieces.1, i64* %8, align 8, !dbg !223 %9 = getelementptr inbounds %"std::fmt::Arguments", %"std::fmt::Arguments"* %0, i32 0, i32 3, !dbg !223 %10 = getelementptr inbounds { i64*, i64 }, { i64*, i64 }* %_4, i32 0, i32 0, !dbg !223 %11 = load i64*, i64** %10, align 8, !dbg !223 %12 = getelementptr inbounds { i64*, i64 }, { i64*, i64 }* %_4, i32 0, i32 1, !dbg !223 %13 = load i64, i64* %12, align 8, !dbg !223 %14 = getelementptr inbounds { i64*, i64 }, { i64*, i64 }* %9, i32 0, i32 0, !dbg !223 store i64* %11, i64** %14, align 8, !dbg !223 %15 = getelementptr inbounds { i64*, i64 }, { i64*, i64 }* %9, i32 0, i32 1, !dbg !223 store i64 %13, i64* %15, align 8, !dbg !223 %16 = getelementptr inbounds %"std::fmt::Arguments", %"std::fmt::Arguments"* %0, i32 0, i32 5, !dbg !223 %17 = getelementptr inbounds { [0 x { i8*, i64* }]*, i64 }, { [0 x { i8*, i64* }]*, i64 }* %16, i32 0, i32 0, !dbg !223 store [0 x { i8*, i64* }]* %args.0, [0 x { i8*, i64* }]** %17, align 8, !dbg !223 %18 = getelementptr inbounds { [0 x { i8*, i64* }]*, i64 }, { [0 x { i8*, i64* }]*, i64 }* %16, i32 0, i32 1, !dbg !223 store i64 %args.1, i64* %18, align 8, !dbg !223 ret void, !dbg !224 } ; core::ops::function::FnOnce::call_once{{vtable.shim}} ; Function Attrs: inlinehint uwtable define internal i32 @"_ZN4core3ops8function6FnOnce40call_once$u7b$$u7b$vtable.shim$u7d$$u7d$17h07a3d3e0729b96baE"(i64** %_1) unnamed_addr #2 !dbg !225 { start: %_1.dbg.spill = alloca i64**, align 8 %_2 = alloca {}, align 1 store i64** %_1, i64*** %_1.dbg.spill, align 8 call void @llvm.dbg.declare(metadata i64*** %_1.dbg.spill, metadata !234, metadata !DIExpression()), !dbg !239 call void @llvm.dbg.declare(metadata {}* %_2, metadata !235, metadata !DIExpression()), !dbg !239 %0 = load i64*, i64** %_1, align 8, !dbg !239, !nonnull !4 ; call core::ops::function::FnOnce::call_once %1 = call i32 @_ZN4core3ops8function6FnOnce9call_once17h6e81d1ba09139127E(i64* nonnull %0), !dbg !239 br label %bb1, !dbg !239 bb1: ; preds = %start ret i32 %1, !dbg !239 } ; core::ops::function::FnOnce::call_once ; Function Attrs: inlinehint uwtable define internal void @_ZN4core3ops8function6FnOnce9call_once17h21a5088bccbb7ceeE(void ()* nonnull %_1) unnamed_addr #2 !dbg !240 { start: %_1.dbg.spill = alloca void ()*, align 8 %_2 = alloca {}, align 1 store void ()* %_1, void ()** %_1.dbg.spill, align 8 call void @llvm.dbg.declare(metadata void ()** %_1.dbg.spill, metadata !242, metadata !DIExpression()), !dbg !246 call void @llvm.dbg.declare(metadata {}* %_2, metadata !243, metadata !DIExpression()), !dbg !246 call void %_1(), !dbg !246 br label %bb1, !dbg !246 bb1: ; preds = %start ret void, !dbg !246 } ; core::ops::function::FnOnce::call_once ; Function Attrs: inlinehint uwtable define internal i32 @_ZN4core3ops8function6FnOnce9call_once17h6e81d1ba09139127E(i64* nonnull %0) unnamed_addr #2 personality i32 (i32, i32, i64, %"unwind::libunwind::_Unwind_Exception"*, %"unwind::libunwind::_Unwind_Context"*)* @rust_eh_personality !dbg !247 { start: %1 = alloca { i8*, i32 }, align 8 %_2 = alloca {}, align 1 %_1 = alloca i64*, align 8 store i64* %0, i64** %_1, align 8 call void @llvm.dbg.declare(metadata i64** %_1, metadata !251, metadata !DIExpression()), !dbg !253 call void @llvm.dbg.declare(metadata {}* %_2, metadata !252, metadata !DIExpression()), !dbg !253 ; invoke std::rt::lang_start::{{closure}} %2 = invoke i32 @"_ZN3std2rt10lang_start28_$u7b$$u7b$closure$u7d$$u7d$17he0db835a6152dd3dE"(i64** noalias readonly align 8 dereferenceable(8) %_1) to label %bb1 unwind label %cleanup, !dbg !253 bb1: ; preds = %start br label %bb2, !dbg !253 bb2: ; preds = %bb1 ret i32 %2, !dbg !253 bb3: ; preds = %cleanup br label %bb4, !dbg !253 bb4: ; preds = %bb3 %3 = bitcast { i8*, i32 }* %1 to i8**, !dbg !253 %4 = load i8*, i8** %3, align 8, !dbg !253 %5 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %1, i32 0, i32 1, !dbg !253 %6 = load i32, i32* %5, align 8, !dbg !253 %7 = insertvalue { i8*, i32 } undef, i8* %4, 0, !dbg !253 %8 = insertvalue { i8*, i32 } %7, i32 %6, 1, !dbg !253 resume { i8*, i32 } %8, !dbg !253 cleanup: ; preds = %start %9 = landingpad { i8*, i32 } cleanup %10 = extractvalue { i8*, i32 } %9, 0 %11 = extractvalue { i8*, i32 } %9, 1 %12 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %1, i32 0, i32 0 store i8* %10, i8** %12, align 8 %13 = getelementptr inbounds { i8*, i32 }, { i8*, i32 }* %1, i32 0, i32 1 store i32 %11, i32* %13, align 8 br label %bb3 } ; core::ptr::drop_in_place::{{closure}}>
; Function Attrs: inlinehint uwtable
define internal void @"_ZN4core3ptr85drop_in_place$LT$std..rt..lang_start$LT$$LP$$RP$$GT$..$u7b$$u7b$closure$u7d$$u7d$$GT$17h1f2c731336d07166E"(i64** %_1) unnamed_addr #2 !dbg !254 {
start:
%_1.dbg.spill = alloca i64**, align 8
%0 = alloca {}, align 1
store i64** %_1, i64*** %_1.dbg.spill, align 8
call void @llvm.dbg.declare(metadata i64*** %_1.dbg.spill, metadata !260, metadata !DIExpression()), !dbg !263
ret void, !dbg !263
}
; core::hint::black_box
; Function Attrs: inlinehint uwtable
define internal void @_ZN4core4hint9black_box17hfabbc7664b85073eE() unnamed_addr #2 !dbg !264 {
start:
%dummy = alloca {}, align 1
call void @llvm.dbg.declare(metadata {}* %dummy, metadata !270, metadata !DIExpression()), !dbg !271
call void asm sideeffect "", "r,~{memory},~{dirflag},~{fpsr},~{flags}"({}* %dummy), !dbg !272, !srcloc !273
ret void, !dbg !274
}
; <() as std::process::Termination>::report
; Function Attrs: inlinehint uwtable
define internal i32 @"_ZN54_$LT$$LP$$RP$$u20$as$u20$std..process..Termination$GT$6report17h381b611d03f4782aE"() unnamed_addr #2 !dbg !275 {
start:
%self.dbg.spill = alloca {}, align 1
call void @llvm.dbg.declare(metadata {}* %self.dbg.spill, metadata !282, metadata !DIExpression()), !dbg !283
; call ::report
%0 = call i32 @"_ZN68_$LT$std..process..ExitCode$u20$as$u20$std..process..Termination$GT$6report17h391900a6658647e0E"(i8 0), !dbg !284
br label %bb1, !dbg !284
bb1: ; preds = %start
ret i32 %0, !dbg !285
}
; ::report
; Function Attrs: inlinehint uwtable
define internal i32 @"_ZN68_$LT$std..process..ExitCode$u20$as$u20$std..process..Termination$GT$6report17h391900a6658647e0E"(i8 %0) unnamed_addr #2 !dbg !286 {
start:
%self = alloca i8, align 1
store i8 %0, i8* %self, align 1
call void @llvm.dbg.declare(metadata i8* %self, metadata !293, metadata !DIExpression()), !dbg !294
; call std::sys::unix::process::process_common::ExitCode::as_i32
%1 = call i32 @_ZN3std3sys4unix7process14process_common8ExitCode6as_i3217he414c8ec5ab83350E(i8* noalias readonly align 1 dereferenceable(1) %self), !dbg !295
br label %bb1, !dbg !295
bb1: ; preds = %start
ret i32 %1, !dbg !296
}
; scratchpad::main
; Function Attrs: uwtable
define internal void @_ZN10scratchpad4main17h3e4e0a32c31c7911E() unnamed_addr #1 !dbg !297 {
start:
%_2 = alloca %"std::fmt::Arguments", align 8
; call core::fmt::Arguments::new_v1
call void @_ZN4core3fmt9Arguments6new_v117h13e4f70e15a317eeE(%"std::fmt::Arguments"* noalias nocapture sret dereferenceable(48) %_2, [0 x { [0 x i8]*, i64 }]* noalias nonnull readonly align 8 bitcast (<{ i8*, [8 x i8] }>* @alloc2 to [0 x { [0 x i8]*, i64 }]*), i64 1, [0 x { i8*, i64* }]* noalias nonnull readonly align 8 bitcast (<{ [0 x i8] }>* @alloc4 to [0 x { i8*, i64* }]*), i64 0), !dbg !300
br label %bb1, !dbg !300
bb1: ; preds = %start
; call std::io::stdio::_print
call void @_ZN3std2io5stdio6_print17hea90da9dad6f182dE(%"std::fmt::Arguments"* noalias nocapture dereferenceable(48) %_2), !dbg !300
br label %bb2, !dbg !300
bb2: ; preds = %bb1
ret void, !dbg !301
}
; Function Attrs: nounwind uwtable
declare i32 @rust_eh_personality(i32, i32, i64, %"unwind::libunwind::_Unwind_Exception"*, %"unwind::libunwind::_Unwind_Context"*) unnamed_addr #3
; Function Attrs: nounwind readnone speculatable willreturn
declare void @llvm.dbg.declare(metadata, metadata, metadata) #4
; std::rt::lang_start_internal
; Function Attrs: uwtable
declare i64 @_ZN3std2rt19lang_start_internal17h86f505dc7de50d93E({}* nonnull align 1, [3 x i64]* noalias readonly align 8 dereferenceable(24), i64, i8**) unnamed_addr #1
; std::io::stdio::_print
; Function Attrs: uwtable
declare void @_ZN3std2io5stdio6_print17hea90da9dad6f182dE(%"std::fmt::Arguments"* noalias nocapture dereferenceable(48)) unnamed_addr #1
define i32 @main(i32 %0, i8** %1) unnamed_addr #5 {
top:
%2 = sext i32 %0 to i64
; call std::rt::lang_start
%3 = call i64 @_ZN3std2rt10lang_start17h3d503a6b6a81c10bE(void ()* @_ZN10scratchpad4main17h3e4e0a32c31c7911E, i64 %2, i8** %1)
%4 = trunc i64 %3 to i32
ret i32 %4
}
attributes #0 = { noinline uwtable "frame-pointer"="all" "probe-stack"="__rust_probestack" "target-cpu"="core2" }
attributes #1 = { uwtable "frame-pointer"="all" "probe-stack"="__rust_probestack" "target-cpu"="core2" }
attributes #2 = { inlinehint uwtable "frame-pointer"="all" "probe-stack"="__rust_probestack" "target-cpu"="core2" }
attributes #3 = { nounwind uwtable "frame-pointer"="all" "probe-stack"="__rust_probestack" "target-cpu"="core2" }
attributes #4 = { nounwind readnone speculatable willreturn }
attributes #5 = { "frame-pointer"="all" "target-cpu"="core2" }
!llvm.module.flags = !{!14, !15, !16, !17}
!llvm.dbg.cu = !{!18}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "vtable", scope: null, file: !2, type: !3, isLocal: true, isDefinition: true)
!2 = !DIFile(filename: "", directory: "")
!3 = !DICompositeType(tag: DW_TAG_structure_type, name: "vtable", file: !2, align: 64, flags: DIFlagArtificial, elements: !4, vtableHolder: !5, identifier: "vtable")
!4 = !{}
!5 = !DICompositeType(tag: DW_TAG_structure_type, name: "closure-0", scope: !6, file: !2, size: 64, align: 64, elements: !9, templateParams: !4, identifier: "d165d88e24f1c6d771abba0a450bb05b")
!6 = !DINamespace(name: "lang_start", scope: !7)
!7 = !DINamespace(name: "rt", scope: !8)
!8 = !DINamespace(name: "std", scope: null)
!9 = !{!10}
!10 = !DIDerivedType(tag: DW_TAG_member, name: "__0", scope: !5, file: !2, baseType: !11, size: 64, align: 64)
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, name: "fn()", baseType: !12, size: 64, align: 64, dwarfAddressSpace: 0)
!12 = !DISubroutineType(types: !13)
!13 = !{null}
!14 = !{i32 7, !"PIC Level", i32 2}
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```