[Issue 14719] Template instantiation parsed as C-style type cast

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14719

--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> ---
(In reply to Yuxuan Shui from comment #2)
> First, (a!A) is not always a type, it can be a function or anything.

Yes, it's not yet determined in parsing stage. The determination will be done
in later semantic analysis stage.

> Second, B is a type, so parse !B as expression is weird.

Similarly to a!A, B is an identifier expression and it's not yet determined as
a type in parsing. A syntactically valid D code may be rejected by semantic
analysis, so it's not a problem.

Note that, D does not use exclamation mark `!` as binary operator, so !B is
always parsed as an unary expression (logical negation). Then prefixing
parenthesis (a!A) is parsed as C-style cast. There's no grammar ambiguity.

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