Merge pull request #37 from petermm/fix-check

Fix check function

Author: bettio

lib/mix/tasks/check.ex

@@ -193,7 +193,7 @@ defmodule Mix.Tasks.Atomvm.Check do
     missing_instructions = MapSet.difference(instructions_set, avail_instructions)
 
     if MapSet.size(missing_instructions) != 0 do
-      if MapSet.member?(missing, "elixir_erl_pass:parens_map_field/2") do
+      if MapSet.member?(missing_instructions, "elixir_erl_pass:parens_map_field/2") do
         IO.puts("""
         Error:
           using module.function() notation (with parentheses) to fetch