Colon in macro definition in guarded header parse failure

[mathstuf]

Configuration: https://gist.github.com/mathstuf/d28e774a3f7b3e7f058db1a65b1cf9f3

Source:

#ifndef header_guard
#define header_guard

#define COLON :

#endif // header_guard

Taking away the header guard makes it parse properly.

Command and output:

% uncrustify -c .uncrustify.cfg --replace define-colon.cxx
do_source_file: Parsing: define-colon.cxx as language CPP
combine_labels(429): define-colon.cxx:4 unexpected colon in col 15 n-parent=NONE c-parent=NONE l=1 bl=

% uncrustify -v
Uncrustify-0.78.1