Simple test is failing

[fran6co]

I'm getting this error when trying to compile the simple test, it seems an easy fix but I don't have the time to check it out:

ERROR: /mnt/c/Users/franc/Code/vc4asm/sample/simple/smitest.qasm (77,41): Invalid operator: &-
ERROR: /mnt/c/Users/franc/Code/vc4asm/sample/simple/smitest.qasm (78,74): Invalid operator: &-
ERROR: /mnt/c/Users/franc/Code/vc4asm/sample/simple/smitest.qasm (147,42): Invalid operator: &-
ERROR: /mnt/c/Users/franc/Code/vc4asm/sample/simple/smitest.qasm (148,76): Invalid operator: &-