Bug 21466 – Calling an enum value result in confusing error message "No property X for type Y"

Reduced case: ``` enum Foo { a, b, } void main () { auto z = Foo.a(STC.b); } ``` Gives: ``` parseme.d(9): Error: no property a for type int ``` This is quite confusing, as the error message doesn't actually tell what's wrong (a is not callable). This is reduced from a bigger error, where the actual code used a ternary and was missing a bitwise OR (`|`), causing the line to be interpreted as a call.

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