Logging a tuple causes an LLVM assertion to fail

[lkuper]

fn main() {
    auto t = tup(1, 2, 3);
    log_err t;
}

fails to compile with:

rustc: /home/lkuper/llvm/include/llvm/Support/Casting.h:202: typename llvm::cast_retty<To, From>::ret_type llvm::cast(const Y&) [with X = llvm::IntegerType, Y = llvm::Type_, typename llvm::cast_retty<To, From>::ret_type = llvm::IntegerType_]: Assertion `isa(Val) && "cast() argument of incompatible type!"' failed.

[msullivan]

This also happens with vec, tag, and rec. float compiles but doesn't log properly.

[msullivan]

Oops. floats work fine. vec, tag, and rec actually don't work, though.

[msullivan]

I fixed this with https://github.com/graydon/rust/pull/406. I am going to close this bug and open a new one for actually implementing it.