Tags: patch

mksh supports characters well beyond [:alnum:_] in its function names.
More specifically, syn.c:function_body says the following

	/*-
	 * Check for valid characters in name. POSIX and AT&T ksh93 say
	 * only allow [a-zA-Z_0-9] but this allows more as old pdkshs
	 * have allowed more; the following were never allowed:
	 *	NUL TAB NL SP " $ & ' ( ) ; < = > \ ` |
	 * C_QUOTE|C_SPC covers all but adds # * ? [ ]
	 */

However, it seems like executing a function with a forward-slash (/)
character in it is impossible as well.

Attached patch adds a mksh-specific entry to sh-imenu-generic-expression
to do that.