Second debugging version of previous commit (40fc4ae), to wrap &blocks only when there is a Func check. (bug 278)

Author: md-work

lib/contracts/call_with.rb

@@ -81,18 +81,8 @@ def call_with_inner(returns, this, *args, &blk)
                  method.call(*args, &blk)
                else
                  # original method name reference
-                 target_block = nil
-                 blk_is_contract = false
-                 if blk
-                   if blk.is_a?(Contract) # rubocop:disable Style/IfUnlessModifier
-                     blk_is_contract = true
-                   end
-                 end
-                 if blk_is_contract # rubocop:disable Style/ConditionalAssignment
-                   target_block = lambda { |*params| blk.call(*params) }
-                 else
-                   target_block = blk
-                 end
+                 target_block = blk
+                 target_block = lambda { |*params| blk.call(*params) } if blk_is_contract
                  method.send_to(this, *args, &target_block)
                end