Bug 14978 – Improve incorrect AA declaration error message

Code: void main() { (const(char)*)[string] aa; } Error messages: test.d(3): Error: (arguments) expected following const(char) test.d(3): Error: expression expected, not ')' test.d(3): Error: found 'aa' when expecting ')' It would be nice if the error messages were clearer (and more precise).

Unfortunately, I don't think this can be fixed. Once you have `()` the compiler expects an expression. If you have a type, it simply treats the expression as a cast. However, the parser does not exactly if you have a type or not inside the params, it just checks what's next after `)`. I tried fixing it by checking whether after `)` we have a left bracket (`[`) [1], but that is not enough, because we need more context than this (namely, we need to know if we had a type or not inside the parens, but that is available only at semantic time). That is why I think that this is WONTFIX bug report. [1] https://github.com/dlang/dmd/pull/14544