Put all ascii box methods into a Debugging category.

AsyncDisplayKit/ASDisplayNode.h

@@ -48,7 +48,7 @@ typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode *node);
  *
  */
 
-@interface ASDisplayNode : ASDealloc2MainObject <ASLayoutable, ASLayoutableAsciiArtProtocol>
+@interface ASDisplayNode : ASDealloc2MainObject <ASLayoutable>
 
 
 /** @name Initializing a node object */
@@ -659,6 +659,9 @@ typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode *node);
 - (void)addSubnode:(ASDisplayNode *)node;
 @end
 
+@interface ASDisplayNode (Debugging) <ASLayoutableAsciiArtProtocol>
+@end
+
 @interface ASDisplayNode (Deprecated)
 
 - (void)reclaimMemory ASDISPLAYNODE_DEPRECATED;

AsyncDisplayKit/ASDisplayNode.mm

@@ -2074,19 +2074,6 @@ static void _recursivelySetDisplaySuspended(ASDisplayNode *node, CALayer *layer,
   return self;
 }
 
-
-#pragma mark - ASLayoutableAsciiArtProtocol
-
-- (NSString *)asciiArtString
-{
-  return [ASLayoutSpec asciiArtStringForChildren:@[] parentName:[self asciiArtName]];
-}
-
-- (NSString *)asciiArtName
-{
-  return NSStringFromClass([self class]);
-}
-
 @end
 
 @implementation ASDisplayNode (Debugging)
@@ -2150,6 +2137,18 @@ static void _recursivelySetDisplaySuspended(ASDisplayNode *node, CALayer *layer,
   return subtree;
 }
 
+#pragma mark - ASLayoutableAsciiArtProtocol
+
+- (NSString *)asciiArtString
+{
+    return [ASLayoutSpec asciiArtStringForChildren:@[] parentName:[self asciiArtName]];
+}
+
+- (NSString *)asciiArtName
+{
+    return NSStringFromClass([self class]);
+}
+
 @end
 
 // We use associated objects as a last resort if our view is not a _ASDisplayView ie it doesn't have the _node ivar to write to

AsyncDisplayKit/Layout/ASLayoutSpec.h

@@ -12,7 +12,7 @@
 #import <AsyncDisplayKit/ASAsciiArtBoxCreator.h>
 
 /** A layout spec is an immutable object that describes a layout, loosely inspired by React. */
-@interface ASLayoutSpec : NSObject <ASLayoutable, ASLayoutableAsciiArtProtocol>
+@interface ASLayoutSpec : NSObject <ASLayoutable>
 
 /** 
  * Creation of a layout spec should only happen by a user in layoutSpecThatFits:. During that method, a
@@ -95,7 +95,9 @@
 
 /** Returns all children added to this layout spec. */
 - (NSArray *)children;
+@end
 
+@interface ASLayoutSpec (Debugging) <ASLayoutableAsciiArtProtocol>
 /**
  *  Used by other layout specs to create ascii art debug strings
  */

AsyncDisplayKit/Layout/ASLayoutSpec.mm

@@ -122,6 +122,10 @@ static NSString * const kDefaultChildrenKey = @"kDefaultChildrenKey";
   return self.layoutChildren[kDefaultChildrenKey];
 }
 
+@end
+
+@implementation ASLayoutSpec (Debugging)
+
 #pragma mark - ASLayoutableAsciiArtProtocol
 
 + (NSString *)asciiArtStringForChildren:(NSArray<id<ASLayoutableAsciiArtProtocol>> *)children parentName:(NSString *)parentName direction:(ASStackLayoutDirection)direction

AsyncDisplayKit/Layout/ASOverlayLayoutSpec.mm

@@ -72,6 +72,10 @@ static NSString * const kOverlayChildKey = @"kOverlayChildKey";
   return nil;
 }
 
+@end
+
+@implementation ASOverlayLayoutSpec (Debugging)
+
 #pragma mark - ASLayoutableAsciiArtProtocol
 
 - (NSString *)debugBoxString

AsyncDisplayKit/Layout/ASRatioLayoutSpec.mm

@@ -86,6 +86,10 @@
   return nil;
 }
 
+@end
+
+@implementation ASRatioLayoutSpec (Debugging)
+
 #pragma mark - ASLayoutableAsciiArtProtocol
 
 - (NSString *)asciiArtName

AsyncDisplayKit/Layout/ASStackLayoutSpec.mm

@@ -135,6 +135,10 @@
                                    sublayouts:sublayouts];
 }
 
+@end
+
+@implementation ASStackLayoutSpec (Debugging)
+
 #pragma mark - ASLayoutableAsciiArtProtocol
 
 - (NSString *)asciiArtString

AsyncDisplayKit/Layout/ASStaticLayoutSpec.mm

@@ -84,6 +84,10 @@
   return nil;
 }
 
+@end
+
+@implementation ASStaticLayoutSpec (Debugging)
+
 #pragma mark - ASLayoutableAsciiArtProtocol
 
 - (NSString *)debugBoxString