Fix typo in Trace#respond_to_missing? (close #490)

Author: flash-gordon

lib/dry/schema/trace.rb

@@ -7,6 +7,7 @@ module Schema
     # @api private
     class Trace < ::BasicObject
       INVALID_PREDICATES = %i[key?].freeze
+      RESPOND_TO_MISSING_METHOD = ::Kernel.instance_method(:respond_to_missing?)
 
       include ::Dry::Equalizer(:compiler, :captures)
 
@@ -86,12 +87,13 @@ def reduced_rule
       end
 
       def respond_to_missing?(meth, include_private = false)
-        super || (meth.to_s.end_with?(QUESTION_MARK) && compuiler.support?(meth))
+        RESPOND_TO_MISSING_METHOD.bind_call(self, meth, include_private) ||
+          (meth.to_s.end_with?(QUESTION_MARK) && compiler.support?(meth))
       end
 
       # @api private
       def method_missing(meth, *args, &block)
-        if meth.to_s.end_with?(QUESTION_MARK)
+        if !meth.equal?(:respond_to_missing?) && meth.to_s.end_with?(QUESTION_MARK)
           if ::Dry::Schema::Trace::INVALID_PREDICATES.include?(meth)
             ::Kernel.raise InvalidSchemaError, "#{meth} predicate cannot be used in this context"
           end

spec/unit/dry/schema/trace_spec.rb

@@ -31,4 +31,18 @@
       expect { trace.not_here }.to raise_error(NoMethodError, /not_here/)
     end
   end
+
+  describe "#respond_to?" do
+    let(:respond_to) do
+      Kernel.instance_method(:respond_to?)
+    end
+
+    it "returns true for predicates" do
+      expect(respond_to.bind_call(trace, :eql?)).to be(true)
+    end
+
+    it "returns false for other methods" do
+      expect(respond_to.bind_call(trace, :not_here?)).to be(false)
+    end
+  end
 end