[Issue 12579] DMD rejects valid function literal

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12579

--- Comment #3 from brian-schott at cox.net ---
The grammar also states that function literals can have contracts by using the
FunctionBody rule, but the compiler rejects this:

void function() f = in { assert(true); } body { writeln("hello world"); }

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