xmls-rs fails llvm verification

[jrmuizel]

building xml-rs 0.7.0 with RUSTFLAGS="-g --emit=llvm-ir" cargo build --release gives the following verification error:

Instruction has a name, but provides a void value!
  %.old70.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7777, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17241
Instruction has a name, but provides a void value!
  %.old71.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7777, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17241
Instruction has a name, but provides a void value!
  %.old72.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [29 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.90 to [0 x i8]*), metadata !7778, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17241
Instruction has a name, but provides a void value!
  %.old73.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 29, metadata !7778, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17241
Instruction has a name, but provides a void value!
  %.old74.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7756, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17244
Instruction has a name, but provides a void value!
  %.old75.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7756, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17244
Instruction has a name, but provides a void value!
  %.old76.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [29 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.90 to [0 x i8]*), metadata !7757, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17244
Instruction has a name, but provides a void value!
  %.old77.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 29, metadata !7757, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17244
Instruction has a name, but provides a void value!
  %.old78.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7748, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17247
Instruction has a name, but provides a void value!
  %.old79.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7748, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17247
Instruction has a name, but provides a void value!
  %.old80.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [29 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.90 to [0 x i8]*), metadata !7749, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17247
Instruction has a name, but provides a void value!
  %.old81.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 29, metadata !7749, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17247
Instruction has a name, but provides a void value!
  %.old84.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7777, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17284
Instruction has a name, but provides a void value!
  %.old85.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7777, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17284
Instruction has a name, but provides a void value!
  %.old86.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [36 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.94 to [0 x i8]*), metadata !7778, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17284
Instruction has a name, but provides a void value!
  %.old87.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 36, metadata !7778, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17284
Instruction has a name, but provides a void value!
  %.old88.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7756, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17287
Instruction has a name, but provides a void value!
  %.old89.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7756, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17287
Instruction has a name, but provides a void value!
  %.old90.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [36 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.94 to [0 x i8]*), metadata !7757, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17287
Instruction has a name, but provides a void value!
  %.old91.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 36, metadata !7757, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17287
Instruction has a name, but provides a void value!
  %.old92.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* %.idx.val4.i.i24.i.i.i.i.i.i, metadata !7748, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17290
Instruction has a name, but provides a void value!
  %.old93.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 %118, metadata !7748, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17290
Instruction has a name, but provides a void value!
  %.old94.i.i.i.i.i.i = call void @llvm.dbg.value(metadata [0 x i8]* bitcast (<{ [36 x i8] }>* @anon.daf8cbbfbadaec1beb73107e02b11708.94 to [0 x i8]*), metadata !7749, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)) #12, !dbg !17290
Instruction has a name, but provides a void value!
  %.old95.i.i.i.i.i.i = call void @llvm.dbg.value(metadata i64 36, metadata !7749, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)) #12, !dbg !17290
LLVM ERROR: Broken function found, compilation aborted!

[nagisa]

Is this a regression?

[jrmuizel]

Not as far as I know.

[nikic]

I can reproduce this on beta, but not on nightly, so probably this got fixed by something in the meantime.

[jrmuizel]

Indeed this seems fixed with nightly. It's probably not worth investigating further.