LLVM assertion failure with -O -g --test

[jbalintbiro]

When i'm trying to compile this file:
https://github.com/saati/skiplist-rs/blob/master/src/skiplist.rs

with rustc -O -g --test

bjb@b:~/code/skiplist-rs$ rustc -O -g --test src/skiplist.rs 
rustc: /home/bjb/src/rust/src/llvm/lib/CodeGen/LexicalScopes.cpp:179: llvm::LexicalScope* llvm::LexicalScopes::getOrCreateRegularScope(llvm::MDNode*): Assertion `DISubprogram(Scope).describes(MF->getFunction())' failed.
Aborted

[sfackler]

cc @michaelwoerister

[michaelwoerister]

Thanks for the report. I'm closing this as a duplicate of #15156. LLVM doesn't seem to be very stable at the moment when it comes to combining optimization and debuginfo (which is a hard problem; don't want to complain about the LLVM folks :)