     else {
       let b = UnsafeBufferPointer(start: c.startUTF16, count: c.count)
       var i = b.makeIterator()
-      result = _parseASCIIOutlined(codeUnits: &i, radix: r)
+      result = Self._parseASCIIOutlined(codeUnits: &i, radix: r)
     }
     guard _fastPath(result != nil) else { return nil }
     self = result!

    let result: Self?
    if _slowPath(c._baseAddress == nil) {
      var i = s.utf16.makeIterator()
      result = _parseASCIIOutlined(codeUnits: &i, radix: r)
    }
    else if _fastPath(c.elementWidth == 1), let a = c.asciiBuffer {
      var i = a.makeIterator()

  }
}

extension FixedWidthInteger {
  /// _parseASCII function thunk that prevents inlining used as an
  /// implementation detail for FixedWidthInteger.init(_: radix:).
  @inline(never)
  internal static func _parseASCIIOutlined<
    CodeUnits : IteratorProtocol, Result: FixedWidthInteger
  >(
    codeUnits: inout CodeUnits, radix: Result
  ) -> Result?
  where CodeUnits.Element : UnsignedInteger {
    return _parseASCII(codeUnits: &codeUnits, radix: radix)
  }

  /// Creates a new integer value from the given string and radix.
  ///
  /// The string passed as `text` may begin with a plus or minus sign character
