LLVM assertion failure when calling insert on a std::map::Hashmap<(@str, T), T>

[Dretch]

Given this code:

extern mod std;

fn main() {
    let x = std::map::HashMap();
    x.insert((@"abc", 0), 0);
}

rustc produces:

rustc: /home/gareth/projects/rust/src/llvm/lib/VMCore/Instructions.cpp:1062: void  llvm::StoreInst::AssertOK(): Assertion `getOperand(0)->getType() == cast<PointerType>(getOperand(1)->getType())->getElementType() && "Ptr must be a pointer to Val type!"' failed.
Aborted (core dumped)

[rntz]

This is due to the code committed in rntz@d718bc2, specifically the pattern match let &(ref a, ref b) = &self;. I'll go write up a workaround that avoids this pattern so that you can use HashMap<(@str,T),T> etc., but the real bug is in the compiler.