`Time.diff_us` has infinite recursion caused by operator overloading

[radekm]

It seems that 0.7.1 added infinite recursion to Time.diff_us. It is defined as:

c3c/lib/std/time/time.c3

Line 99 in 3f07d1c

fn Duration Time.diff_us(time, Time other) @operator(-) => (Duration)(time - other);

I believe that it should be defined as:

fn Duration Time.diff_us(time, Time other) @operator(-) => (Duration)((long)time - (long)other);

[lerno]

Should be fixed now. I also updated some of the overloading codegen

[1player]

Fix works for me