-x seems not accept sub-dir

[assalyn]

In my case, when use cmd: gin -i -p 3014 -b gateway -t src -d src/server/gateway -x src/test the -x src/test seems doesn't work. any modify in test directory will cause recompile

but, when enter src/ use cmd gin -i -p 3014 -b gateway -t . -d server/gateway -x test then, it's all ok.

So I guess maybe some flaw in -x ?

environment: golang1.9 cgywin in win10