Generated C code fails to compile when immediatly trying to use option type returned from function with or {} block

[fabricio-p]

V version:0.2.2
OS:linux, Linux version 3.18.35 (software@zechin230) (gcc version 4.8 (GCC) ) #2 SMP PREEMPT Tue Apr 17 15:56:14 CST 2018 (chroot)

What did you do?

module main

fn foo(fail bool) ?string {
       return if fail { error("failure") } else { "success" }
}

fn main() {
       assert (foo(true) or { "" }) != ""
}

v -cg -stats run foo.v

What did you expect to see?

foo.v:9: FAIL: fn main.main: assert (foo(true) or { "" }) != ''
   left value: (foo(true) or { "" }) =
  right value: '' =
V panic: Assertion failed...
v hash: c30cda3
C.backtrace returned less than 2 frames

What did you see instead?

/data/data/com.termux/files/usr/tmp/v/foo.13299262341088717093.tmp.c:10292:34: error: expected ';' after expression
                *(string*) _t1.data = _SLIT("")}
                                               ^
                                               ;
1 error generated.
builder error:
==================
C error. This should never happen.

If you were not working with C interop, this is a compiler bug, please report the bug using `v bug file.v`.

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