MFAs 🤦

Author: probably-not

lib/safe_nif/runner.ex

@@ -7,10 +7,9 @@ defmodule SafeNIF.Runner do
   defguardp is_runnable(runnable)
             when is_function(runnable, 0) or
                    (is_tuple(runnable) and
-                      is_atom(
-                        elem(runnable, 0) and is_list(elem(runnable, 2)) and
-                          is_function(elem(runnable, 1), length(elem(runnable, 2)))
-                      ))
+                      is_atom(elem(runnable, 0)) and
+                      is_atom(elem(runnable, 1)) and
+                      is_list(elem(runnable, 2)))
 
   def start_link({ref, runnable, caller} = init_arg)
       when is_reference(ref) and is_runnable(runnable) and is_pid(caller) do

lib/safe_nif/wrapped_call.ex

@@ -8,12 +8,12 @@ defmodule SafeNIF.WrappedCall do
     end
   end
 
-  def call(pid, {mod, fun, args}) when is_atom(mod) and is_list(args) and is_function(fun, length(args)) do
+  def call(pid, {mod, fun, args}) when is_atom(mod) and is_atom(fun) and is_list(args) do
     {__MODULE__, :wrapped, [pid, mod, fun, args]}
   end
 
   @doc false
-  def wrapped(pid, mod, fun, args) when is_atom(mod) and is_list(args) and is_function(fun, length(args)) do
+  def wrapped(pid, mod, fun, args) when is_atom(mod) and is_atom(fun) and is_list(args) do
     result = apply(mod, fun, args)
     send(pid, {:ok, result})
   end