if pc.alt == nil {
			if err != errCallerOwnsConn {
				pc.conn.Close()
			}
			close(pc.closech)
		}
	}
	pc.mutateHeaderFunc = nil
}

var portMap = map[string]string{
	"http":    "80",
	"https":   "443",
	"socks5":  "1080",
	"socks5h": "1080",
}

func idnaASCIIFromURL(url *url.URL) string {
	addr := url.Hostname()

   * IllegalArgumentException} is thrown when the collection operation is performed. (This differs
   * from the {@code Collector} returned by {@link Collectors#toMap(Function, Function)}, which
   * throws an {@code IllegalStateException}.)
   *
   * @since 33.2.0 (available since 21.0 in guava-jre)
   */
  @SuppressWarnings({"AndroidJdkLibsChecker", "Java7ApiChecker"})

	// correct; however, the member function type will never be
	// used in a substitution, so putting the wrong type in the
	// substitution table is harmless.
	mem := st.demangleType(isCast)
	return &PtrMem{Class: cl, Member: mem}
}

// compactNumber parses:
//
//	<non-negative number> _
func (st *state) compactNumber() int {
	if len(st.str) == 0 {
		st.fail("missing index")
	}