Use public api to implement exhaustive pattern matching

Gemfile

@@ -5,4 +5,4 @@ gemspec
 
 # gem 'codeclimate-test-reporter', group: :test, require: nil
 
-gem 'qo', github: 'bolshakov/qo', branch: 'feature/order-of-execution'
+gem 'qo', github: 'baweaver/qo', branch: 'baweaver/exhaustive_match'

fear.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'dry-equalizer', '<= 0.2.1'
-  spec.add_runtime_dependency 'qo', '0.99.0'
+  spec.add_runtime_dependency 'qo', '>= 0.99.1'
 
   spec.add_development_dependency 'appraisal'
   spec.add_development_dependency 'bundler'

lib/fear/exhaustive_pattern_match.rb

@@ -5,6 +5,27 @@ module Fear
   # @api private
   # @see Qo::PatternMatchers::PatternMatch
   module ExhaustivePatternMatch
+    class << self
+      def prepended(base)
+        base.extend(ClassMethods)
+      end
+    end
+
+    module ClassMethods
+      # FIXME: remove after merge https://github.com/baweaver/qo/pull/26
+      def mixin(destructure: false, as: :match)
+        create_self = ->(&function) { new(destructure: destructure, exhaustive: true, &function) }
+
+        Module.new do
+          define_method(as) do |&function|
+            create_self.call(&function).call(self)
+          end
+        end
+      end
+    end
+
+    private_constant :ClassMethods
+
     EXHAUSTIVE_PATTERN_MATCH_ERROR = <<-ERROR.freeze
       Pattern match is not exhaustive.
 
@@ -17,9 +38,10 @@ module ExhaustivePatternMatch
       end
     ERROR
 
-    def initialize(**)
+    def call(*)
       super
-      @default ||= self.else { fail MatchError, EXHAUSTIVE_PATTERN_MATCH_ERROR }
+    rescue Qo::Exceptions::ExhaustiveMatchNotMet
+      raise MatchError, EXHAUSTIVE_PATTERN_MATCH_ERROR
     end
   end