365             if let Scan::Bailout | Scan::Fail = scan_right(expr, self, self.previous_operator, 1, 0)  in rightmost_subexpression_precedence()
458     Fail,  enumerator
536                 Scan::Fail  in scan_right()
567                 Scan::Fail => {}  in scan_right()
575             } else if let (Scan::Fail, Precedence::Unambiguous) = (scan, fixup.next_operator) {  in scan_right()
576                 Scan::Fail  in scan_right()
605                 Scan::Fail => {}  in scan_right()
611             } else if let (Scan::Fail, Precedence::Unambiguous) = (scan, fixup.next_operator) {  in scan_right()
612                 Scan::Fail  in scan_right()
635                     (Scan::Fail, _) => false,  in scan_right()
644                     Scan::Fail  in scan_right()
651                     Scan::Fail  in scan_right()
662                     Scan::Fail => Scan::Bailout,  in scan_right()
667                 Precedence::Assign if precedence > Precedence::Assign => Scan::Fail,  in scan_right()
679                     Scan::Fail => Scan::Bailout,  in scan_right()
684                 Precedence::Assign if precedence > Precedence::Assign => Scan::Fail,  in scan_right()
698                     Scan::Fail => Scan::Bailout,  in scan_right()
722                 Scan::Fail | Scan::Bailout if fixup.next_operator < Precedence::Let => {  in scan_right()
730             } else if let Scan::Fail = scan {  in scan_right()
768             Precedence::Assign | Precedence::Range if precedence == Precedence::Range => Scan::Fail,  in scan_right()
770                 Scan::Fail  in scan_right()