alias to fully qualified enum in scope where enum is expected

[Timothee Cour via Digitalmars-d-learn]

Is there a simple way to to do this?

enum A{
a1,
a2
}

void fun(A a){...}
void test(){
 fun(A.a1); //works
 fun(a1); //I'd like a1 to work, but just where an A is expected to avoid
polluting namespace.
}
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