Created attachment 250822 [details]
Minimal project demonstrating this bug

Doxygen will hang if the argument for retval contains a greater sign `>' surrounded by two non-space characters.

Version tested: doxygen 1.8.4 on CYGWIN_NT-6.1-WOW64

Sample:

/**
 * @defgroup  any_group  Demonstrate a doxygen bug
 *
 *  The next documented function causes doxygen to hang. The problem
 *  comes from the greater sign. I could not find another command than
 *  retval that produces the same bug.
 */

/**
 * @ingroup any_group
 * @retval  S>F
 */
int bug(void);