[Issue 21449] parser reject constructor call to const(SomeStructDecl)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21449

--- Comment #2 from Basile-z <b2.temp at gmx.com> ---
in https://dlang.org/spec/expression.html#primary_expressions this is the rule

  TypeCtor ( Type ) ( ArgumentListopt )

The parser takes the path of a declaration, it nevers tries a statement, in
this case ExpressionStatement.

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