Remove new symbol and add back old symbol

Author: Azoy

stdlib/public/core/Algorithm.swift

@@ -158,6 +158,3 @@ extension EnumeratedSequence: Sequence {
     return Iterator(_base: _base.makeIterator())
   }
 }
-
-@available(SwiftStdlib 5.11, *)
-public func hello() {}

stdlib/public/core/LegacyABI.swift

@@ -13,13 +13,13 @@
 // This file contains non-API (or underscored) declarations that are needed to
 // be kept around for ABI compatibility
 
-// extension Unicode.UTF16 {
-//   @available(*, unavailable, renamed: "Unicode.UTF16.isASCII")
-//   @inlinable
-//   public static func _isASCII(_ x: CodeUnit) -> Bool  {
-//     return Unicode.UTF16.isASCII(x)
-//   }
-// }
+extension Unicode.UTF16 {
+  @available(*, unavailable, renamed: "Unicode.UTF16.isASCII")
+  @inlinable
+  public static func _isASCII(_ x: CodeUnit) -> Bool  {
+    return Unicode.UTF16.isASCII(x)
+  }
+}
 
 @available(*, unavailable, renamed: "Unicode.UTF8.isASCII")
 @inlinable

test/abi/macOS/arm64/stdlib.swift

@@ -45,10 +45,4 @@ Added: _$ss19_getWeakRetainCountySuyXlF
 // Swift._getUnownedRetainCount(Swift.AnyObject) -> Swift.UInt
 Added: _$ss22_getUnownedRetainCountySuyXlF
 
-// Swift.hello() -> ()
-Added: _$ss5helloyyF
-
-// static Swift.Unicode.UTF16._isASCII(Swift.UInt16) -> Swift.Bool
-Removed: _$ss7UnicodeO5UTF16O8_isASCIIySbs6UInt16VFZ
-
 // Runtime Symbols

test/abi/macOS/x86_64/stdlib.swift

@@ -45,10 +45,4 @@ Added: _$ss19_getWeakRetainCountySuyXlF
 // Swift._getUnownedRetainCount(Swift.AnyObject) -> Swift.UInt
 Added: _$ss22_getUnownedRetainCountySuyXlF
 
-// Swift.hello() -> ()
-Added: _$ss5helloyyF
-
-// static Swift.Unicode.UTF16._isASCII(Swift.UInt16) -> Swift.Bool
-Removed: _$ss7UnicodeO5UTF16O8_isASCIIySbs6UInt16VFZ
-
 // Runtime Symbols

utils/swift-abi-symbol-checker.py

@@ -87,7 +87,7 @@ def main(arguments):
 
     parser.add_argument('changes', help='the changes file')
     parser.add_argument('symbols', help='the symbols file')
-    parser.add_argument('--base',  help='the base changes file')
+    parser.add_argument('--base', help='the base changes file')
 
     args = parser.parse_args(arguments)