I don't want to separate `testx!T();` and `testy!T();` to different lines. It will remove the pairing of between testx and testy for integral types.

Note that, I **never** use non-standard style in druntime and Phobos.

I sometimes consciously use non-standard D style, such as vertical alignment and half indentations, for exhaustive testing. Test code is not a production code, and it is necessary evil for representing some non-functional test attributes.