[Issue 18839] Crash on getMember of function masking imported template function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18839

--- Comment #1 from FeepingCreature <default_357-line at yahoo.de> ---
Further reduction:

void fun2(T)();

alias fun = fun2;

void fun() { }

pragma(msg, __traits(getMember, foo, "fun").stringof);
static assert(__traits(compiles, __traits(getMember, foo, "fun")));

Note that the order of functions - first alias, then mask - is important.

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