Write the format string to an output range until the next format specifier is found and parse that format specifier.
See FormatSpec for an example, how to use writeUpToNextSpec.
the output range
True, when a format specifier is found.
A FormatException when the found format specifier could not be parsed.
See Implementation
Write the format string to an output range until the next format specifier is found and parse that format specifier.
See FormatSpec for an example, how to use writeUpToNextSpec.