Revise print_symbol(), never calling is{float,ratio}_string(). src/ChangeLog addition: 2015-05-08 Aidan Kehoe <kehoea@parhasard.net> * print.c (print_symbol): Revise this. No longer call isfloat_string() and isratio_string() on practically every symbol seen; check explicitly for the known float format in this function, which turns out to be a more limited and cheap job than you would think. Also check for integer and ratio syntax in passing. Use Vdigit_fixnum_map when working out whether a given character is a digit. * lisp.h: Make Vdigit_fixnum_map available generally. tests/ChangeLog addition: 2015-05-08 Aidan Kehoe <kehoea@parhasard.net> * automated/lisp-reader-tests.el: Check read and print handling of symbols that look like numbers. In passing, check the read and print handling of the associated numbers.

--- a/src/lisp.h	Fri May 08 13:58:22 2015 +0100
+++ b/src/lisp.h	Fri May 08 14:33:46 2015 +0100
@@ -4605,6 +4605,8 @@
 			   Bytecount len, EMACS_INT base,
 			   Boolint junk_allowed, Lisp_Object base_table);
 
+extern Lisp_Object Vdigit_fixnum_map;
+
 extern Lisp_Object Qarrayp, Qbitp, Qchar_or_string_p, Qcharacterp,
     Qerror_conditions, Qerror_message, Qinteger_char_or_marker_p,
     Qinteger_or_char_p, Qinteger_or_marker_p, Qlambda, Qlistp, Qnatnump,