[Issue 14557] Check typedef usage at semantic stage

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14557

--- Comment #5 from Dicebot <public at dicebot.lv> ---
Hm, I used it the other way around, to hide D2 grammar from D1 compiler. But
you are right, it should be applicable both ways. Will try that.

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