Calling an iter (as if it were a function) hits llvm assert

[jruderman]

iter i() { }
fn main() { i(); }

Assertion failed: ((NumParams == FTy->getNumParams() || (FTy->isVarArg() && NumParams > FTy->getNumParams())) && "Calling a function with bad signature!"), function init, file Instructions.cpp, line 187.

[msullivan]

Should be rejected by the typechecker.