"Calling a function with a bad signature!" with uncalled type-parameteric function

[jruderman]

fn empty[T]() -> vec[T] { ret []; }
fn main() { empty[int]; }

Assertion failed: ((i >= FTy->getNumParams() || FTy->getParamType(i) == Params[i]->getType()) && "Calling a function with a bad signature!"), function init, file Instructions.cpp, line 191.

Which is strange, because "calling a function" is exactly what this testcase doesn't do.

[msullivan]

The "calling a function" assert is tripped while generating a bind thunk.

[msullivan]

I've fixed a bunch of bugs in trans_bind_thunk recently, so I'll take this.

[msullivan]

Looks like the problem is that we only cast the return pointer in trans_bind_thunk if the type has a dynamic size. If it is something that has a statically known size but still has typarams, we don't cast it, and this causes grief.