Print symbols with ratio-like names and the associated ratios distinctly. src/ChangeLog addition: 2010-08-15 Aidan Kehoe <kehoea@parhasard.net> * print.c (print_symbol): Escape any symbols that look like ratios, in the same way we do symbols that look like floats or integers. Prevents confusion in the Lisp reader. * lread.c (isratio_string): Make this available even on builds without HAVE_RATIO, so we can print symbols that look like ratios with the appropriate escapes. * lisp.h: Make isratio_string available even if HAVE_RATIO is not defined. tests/ChangeLog addition: 2010-08-15 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-tests.el: Test that symbols with names that look like ratios are printed distinctly from the equivalent ratios.

--- a/src/lread.c	Sat Jul 24 17:38:35 2010 +0100
+++ b/src/lread.c	Sun Aug 15 13:29:10 2010 +0100
@@ -2876,7 +2876,6 @@
 	      || state == (DOT_CHAR|TRAIL_INT|E_CHAR|EXP_INT)));
 }
 
-#ifdef HAVE_RATIO
 int
 isratio_string (const char *cp)
 {
@@ -2907,7 +2906,7 @@
   return *cp == '\0' || *cp == ' ' || *cp =='\t' || *cp == '\n' ||
     *cp == '\r' || *cp == '\f';
 }
-#endif
+
 
 static void *
 sequence_reader (Lisp_Object readcharfun,