"alt ret" hits an error in llvm: "cast<Ty>() argument of incompatible type!"

[jruderman]

fn a() -> int { alt ret 1 { 2 { 3 } } }
fn main() { a(); }

Assertion failed: (isa(Val) && "cast() argument of incompatible type!"), function cast, file llvm/include/llvm/Support/Casting.h, line 194.

[msullivan]

For me it now fails with

Basic Block in function '_ZN1aE' does not have terminator!
label %5
LLVM ERROR: Broken module, no Basic Block terminator!

without optimization and works with optimization.

[catamorphism]

Will fix this, looks similar to the bug I fixed this morning.