-R without an adjoined argument now checks whether the next argument

begins with a "-" to determine if it's the -R value versus another option.

doc/chibi-scheme.1

@@ -87,13 +87,8 @@ or its shortcut
 
 .SH OPTIONS
 
-Space is optional between options and their arguments, with the
+Space is optional between options and their arguments.  Options
-exception of
+without arguments may not be chained together.
-.I
--R
-for which the argument is optional, and therefore if present must
-occur without a space.  Options without arguments may not be chained
-together.
 
 To reduce the need for shell escapes, options with module arguments
 (

main.c

@@ -542,7 +542,8 @@ void run_main (int argc, char **argv) {
       break;
 #endif
     case 'R':
-      main_module = argv[i][2] == '\0' ? "chibi.repl" : argv[i]+2;
+      main_module = argv[i][2] != '\0' ? argv[i]+2 :
+        (i+1 < argc && argv[i+1][0] != '-') ? argv[++i] : "chibi.repl";
       if (main_symbol == NULL) main_symbol = "main";
       break;
     case 'r':