[GR-40333] Enumerable#each_cons and each_slice to return a receiver

PullRequest: truffleruby/3641

Author: horakivo

CHANGELOG.md

@@ -73,6 +73,7 @@ Compatibility:
 * Raise `EncodingError` at parse time when Hash literal contains a Symbol key with invalid encoding (#2848, @andrykonchin).
 * Fix `Array` methods `reject`, `reject!`, `inject`, `map`, `select`, `each_index` and handle a case when array is modified by a passed block like CRuby does (#2822, @andrykonchin, @eregon).
 * Fix `Array` methods `select!` and `keep_if` and handle a case when exception is raised in a passed block properly (@andrykonchin).
+* Fix `Enumerable` methods `each_cons` and `each_slice` to return receiver (#2733, @horakivo)
 
 Performance:
 

spec/tags/core/enumerable/each_cons_tags.txt

@@ -660,7 +660,7 @@ def each_cons(num)
       array.shift if array.size > n
       yield array.dup if array.size == n
     end
-    nil
+    self
   end
 
   def each_slice(slice_size)
@@ -685,7 +685,7 @@ def each_slice(slice_size)
     end
 
     yield a unless a.empty?
-    nil
+    self
   end
 
   def find(ifnone=nil)