Bug 16020 – Allow AliasDeclarationY to express function types

std.typecons contains a load of C-ish alias declarations in the unittests. The problem here is the new syntax that doesn't allow to declare the equivalent without typing a silly declaration: for example in typecons: alias int F1(); the only way to get the same type alias using the most modern syntax is import std.traits; alias F1 = PointerTarget!(int function()); and alias F1 = int(); is not allowed at all. There's a **gap** because now we can't say "let's drop the old alias syntax completly".

@Basile-z created dlang/dmd pull request #9667 "fix issue 16020 - Allow AliasDeclarationY to express function types" fixing this issue: - fix issue 16020 - Allow AliasDeclarationY to express function types The (not so) new alias declaration, using the assignment operator, is preferred over the old C-style declarations. However they didn't allow to express function types, which lead to blend the declaration styles. This change adds a new rule to `AliasDeclarationY` to solve the problem, ```diff AliasDeclarationY: + 'alias' Identifier '=' BasicType '(' Parameters ')' Attributes? ``` consolidating the language consistency. https://github.com/dlang/dmd/pull/9667

dlang/dmd pull request #9667 "Grammar change - Allow AliasDeclarationY to express function types" was merged into master: - 527f213573a50896b7b5c85d3a7bc284b520270a by Basile Burg: fix issue 16020 - Allow AliasDeclarationY to express function types https://github.com/dlang/dmd/pull/9667