assertion failure in comptime block

[PavelVozenilek]

This little program crashes the compiler:

const io = @import("std").io;

pub fn main() -> %void {
  const  x  = undefined; /// <<<=== probably this line
  %%io.stdout.printf("{}\n", @typeName(@typeOf(x)));
}

[PavelVozenilek]

Yet another compiler crash:

const io = @import("std").io;

pub fn main() -> %void {

const x = comptime {
  var i : i32 = 99;
  i += 1;
  i; // <<== the ; here does it
};
  %%io.stdout.printf("{}\n", x);
}

[andrewrk]

I fixed the first one. These are separate issues.

[andrewrk]

see #557

If we didn't have the crash from the void value you would have got this error:

/home/andy/dev/zig/build/test.zig:8:3: error: expression value is ignored
  i; // <<== the ; here does it
  ^