[stdlib] Remove now-redundant slicing operations

stdlib/public/core/CollectionAlgorithms.swift.gyb

@@ -466,106 +466,6 @@ ${orderingExplanation}
   }
 }
 
-% for Self in '_Indexable', '_MutableIndexable':
-%{
-
-subscriptCommentPre = """\
-  /// Accesses a contiguous subrange of the collection's elements.
-  ///
-  /// The accessed slice uses the same indices for the same elements as the
-  /// original collection. Always use the slice's `startIndex` property
-  /// instead of assuming that its indices start at a particular value.
-  ///
-  /// This example demonstrates getting a slice of an array of strings, finding
-  /// the index of one of the strings in the slice, and then using that index
-  /// in the original array.
-  ///
-  ///     let streets = ["Adams", "Bryant", "Channing", "Douglas", "Evarts"]
-  ///     let streetsSlice = streets[2 ..< streets.endIndex]
-  ///     print(streetsSlice)
-  ///     // Prints "["Channing", "Douglas", "Evarts"]"
-  ///
-  ///     let index = streetsSlice.index(of: "Evarts")    // 4"""
-
-if 'Mutable' in Self:
-  subscriptCommentMid = """\
-  ///     streets[index!] = "Eustace"
-  ///     print(streets[index!])
-  ///     // Prints "Eustace\""""
-else:
-  subscriptCommentMid = """\
-  ///     print(streets[index!])
-  ///     // Prints "Evarts\""""
-
-subscriptCommentPost = """\
-  ///
-  /// - Parameter bounds: A range of the collection's indices. The bounds of
-  ///   the range must be valid indices of the collection."""
-}%
-// FIXME(ABI)#180 (Type checker)
-// WORKAROUND rdar://25214066 - should be on Collection
-extension ${Self} {
-${subscriptCommentPre}
-${subscriptCommentMid}
-${subscriptCommentPost}
-  @_inlineable
-  public subscript(bounds: ClosedRange<Index>) -> SubSequence {
-    get {
-      return self[
-        Range(
-          uncheckedBounds: (
-            lower: bounds.lowerBound,
-            upper: index(after: bounds.upperBound)))
-      ]
-    }
-%   if 'Mutable' in Self:
-    set {
-      self[
-        Range(
-          uncheckedBounds: (
-            lower: bounds.lowerBound,
-            upper: index(after: bounds.upperBound)))
-      ] = newValue
-    }
-%   end
-  }
-}
-
-// FIXME(ABI)#180 (Type checker)
-// WORKAROUND rdar://25214066 - should be on Collection
-extension ${Self} where Index : Strideable, Index.Stride : SignedInteger {
-${subscriptCommentPre}
-${subscriptCommentMid}
-${subscriptCommentPost}
-  @_inlineable
-  public subscript(bounds: CountableRange<Index>) -> SubSequence {
-    get {
-      return self[Range(bounds)]
-    }
-%   if 'Mutable' in Self:
-    set {
-      self[Range(bounds)] = newValue
-    }
-%   end
-  }
-
-${subscriptCommentPre}
-${subscriptCommentMid}
-${subscriptCommentPost}
-  @_inlineable
-  public subscript(bounds: CountableClosedRange<Index>) -> SubSequence {
-    get {
-      return self[ClosedRange(bounds)]
-    }
-%   if 'Mutable' in Self:
-    set {
-      self[ClosedRange(bounds)] = newValue
-    }
-%   end
-  }
-}
-% end
-
 //===--- Unavailable stuff ------------------------------------------------===//
 
 extension MutableCollection where Self : RandomAccessCollection {