prefix_literal

Description:

[ Version ( since = "2.70" ) ]
[ CCode ( cname = "g_prefix_error_literal" ) ]
public static void prefix_literal (out Error? dest, string prefix)

Prefixes prefix to an existing error message.

If err or *err is null (i.e.: no error variable) then do nothing.

prefix	string to prefix `err` with
err	a return location for a Error, or null