_C_o_e_r_c_e _t_o _a _F_u_n_c_t_i_o_n
	
	     as.function(x)
	
	_D_e_s_c_r_i_p_t_i_o_n:
	
	     It is not possible to coerce objects to mode function.
	     Objects either are functions or are not coercion is not
	     possible.