def _var_used_in_binop(self, varname, expr):
        """return True if 'expr' is a binary expression and 'varname' is used
        in it as an argument
        """
        return (isinstance(expr, ir.Expr)
                and expr.op in ("binop", "inplace_binop")
                and (varname == expr.lhs.name or varname == expr.rhs.name))
return True if 'expr' is a binary expression and 'varname' is used
        in it as an argument
        
numba/core/interpreter.py