.ascii property -> UnicodeScalar?

Author: John Holdsworth

stdlib/public/core/UnicodeScalar.swift

@@ -438,6 +438,15 @@ extension UInt8? {
   }
 }
 
+/// Converts a UInt8 value into a UnicodeScalar
+extension UInt8 {
+  @_transparent @_alwaysEmitIntoClient
+  var ascii: UnicodeScalar? {
+    guard self < 128 else { return nil }
+    return UnicodeScalar(self)
+  }
+}
+
 /// Extends `FixedWidthInteger` providing initialization from a Unicode scalar.
 extension FixedWidthInteger {
   /// Initializes a FixedWidthInteger with the value of the provided Unicode scalar.