Make #'substring an alias of #'subseq; give the latter the byte code. src/ChangeLog addition: 2010-03-03 Aidan Kehoe <kehoea@parhasard.net> * fns.c (Fsubstring): Removed. * search.c (Freplace_match): * minibuf.c (Ftry_completion): * lisp.h: * keymap.c (ensure_meta_prefix_char_keymapp): * dired.c (user_name_completion, file_name_completion): * console-x.c (x_canonicalize_console_connection): * bytecode.c (Bsubseq): * bytecode-ops.h (subseq): Move #'substring to Lisp, as an alias for #'subseq; change all C Fsubstring() calls to Fsubseq(), change the Bsubstring bytecode to Bsubseq. Motivation; not accepting vectors in #'substring is incompatible with GNU, and Common Lisp prefers #'subseq, it has no #'substring. lisp/ChangeLog addition: 2010-03-03 Aidan Kehoe <kehoea@parhasard.net> Move byte code #o117 to #'subseq, not #'substring. Make #'substring available as an alias for #'subseq in Lisp. * bytecomp.el (79, subseq, substring): * bytecomp.el (byte-compile-subseq): New. * update-elc.el (update-elc-chop-extension): Use #'subseq, not #'substring, the latter is not yet available. * subr.el (substring): New alias, to #'subseq. man/ChangeLog addition: 2010-03-03 Aidan Kehoe <kehoea@parhasard.net> * lispref/tips.texi (Comment Tips): * lispref/text.texi (Text Properties): * lispref/strings.texi (Creating Strings): * lispref/processes.texi (Input to Processes): * lispref/functions.texi (Argument List): * lispref/extents.texi (Duplicable Extents): Move examples that used substring to using subseq; in strings.texi, do not change the examples, but document that in this XEmacs, it is an alias for subseq, and that there may be some incompatibilities if you depend on that.

--- a/man/lispref/functions.texi	Tue Mar 02 13:42:37 2010 -0700
+++ b/man/lispref/functions.texi	Wed Mar 03 18:40:12 2010 +0000
@@ -290,10 +290,10 @@
 arguments, you get a @code{wrong-number-of-arguments} error.
 
   It is often convenient to write a function that allows certain
-arguments to be omitted.  For example, the function @code{substring}
-accepts three arguments---a string, the start index and the end
+arguments to be omitted.  For example, the function @code{subseq}
+accepts three arguments---a sequence, the start index and the end
 index---but the third argument defaults to the @var{length} of the
-string if you omit it.  It is also convenient for certain functions to
+sequence if you omit it.  It is also convenient for certain functions to
 accept an indefinite number of arguments, as the functions @code{list}
 and @code{+} do.
 
@@ -331,8 +331,8 @@
 function to distinguish between an explicit argument of @code{nil} and
 an omitted argument.  However, the body of the function is free to
 consider @code{nil} an abbreviation for some other meaningful value.
-This is what @code{substring} does; @code{nil} as the third argument to
-@code{substring} means to use the length of the string supplied.
+This is what @code{subseq} does; @code{nil} as the third argument to
+@code{subseq} means to use the length of the sequence supplied.
 
 @cindex CL note---default optional arg
 @quotation