When it's a lifetime, a single quotation mark shouldn't have a matching single quotation mark inserted after it, as delimitMate does by default. Note that this is not without problems; a char literal coming after an odd number of lifetime markers will have its quotation marks behave a little strangely. That, however, is not my fault, but delimitMate's: https://github.com/Raimondi/delimitMate/issues/135