https://issues.dlang.org/show_bug.cgi?id=22068

          Issue ID: 22068
           Summary: importC: cast-expression accepted as lvalue in
                    unary-expression
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: critical
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

This isn't valid as per C11 6.5.3:
---
++(int)i;

The grammar is:
---
unary-expression:
    postfix-expression
    ++ unary-expression
    -- unary-expression
    unary-operator cast-expression
    sizeof unary-expression
    sizeof ( type-name )
    _Alignof ( type-name )
---

Similar to issue 22067, except here the parser not implementing the grammar correctly bites us even harder.  In the former issue, it's likely an going to be an error deferred to semantic.

--