[Issue 13309] DMD accepts yet another invalid alias declaration

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13309

--- Comment #7 from briancschott at gmail.com ---
alias int a(int), b(int);

test.d(1): Error: multiple declarations must have the same type, not int(int)
and int(int)

It's the same stupid thing again!

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