Happens only with -inline

int expression( string op, Lhs, Rhs )
( auto ref Lhs lhs, auto ref Rhs rhs ) {
	return 0;
}

struct BasicMatrix( Storage_ ) {
    auto opBinary( string op, NewRhs )( auto ref NewRhs newRhs ) {
        alias this thisConverted;      
        return expression!op( thisConverted, newRhs );
    }
}

void ridgeLargeP() {
    BasicMatrix!double cwc;
    auto foo = cwc * cwc;
}

Assertion failure: '!vthis->csym' on line 678 in file 'glue.c'