another code cleanup: removing "comma-separated expressions" from phobos.
https://issues.dlang.org/show_bug.cgi?id=13419 there is only one poisoned file in phobos and druntime: std.uni. there are some "return a, b;" abominations. KILL THE COMMAS! KILL THE COMMAS! KILL THE COMMAS! (found with my "warning on comma-separated expressions" patch, so i can guarantee that nothing is left) KILL THE COMMAS! KILL THE COMMAS! KILL THE COMMAS!
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