[Issue 21992] importC: Error: variable is used as a type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21992

--- Comment #4 from Iain Buclaw <ibuclaw at gdcproject.org> ---
At the moment I do have some lvalue checking in the parser, this'll have to be
moved to semantic as well.  But there are some hurdles to overcome - mostly
from the semantic lowering rvalues into lvalues.

For example, this nudges support in the right direction:
https://github.com/dlang/dmd/pull/12752

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