[ clisp-Bugs-3416966 ] ~% introduces an extra line break

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Bugs item #3416966, was opened at 2011-10-01 14:57
Message generated for change (Tracker Item Submitted) made by mirko_vukovic
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Category: clisp
Group: ANSI compliance issue
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Mirko (mirko_vukovic)
Assigned to: Bruno Haible (haible)
Summary: ~% introduces an extra line break 

Initial Comment:
The following unexpectedly inserts a line-break after `A' :
[2]> (format t "A~aB~%"
 (format nil "5~%~a" 3))
A
5
3B
NIL

But this works:
 (format t "A~?B~%"
 "5~%~a" '(3))
A5
3B
NIL

*pretty-print* effects: The came clisp produces correct input if I set *pretty-print* to nil in SLIME, but if I do the same from within clisp, I get the erroneous output.

clisp was started as > clisp -norc

Other info:
>uname -a
CYGWIN_NT-5.1 WTTCA1068 1.7.8(0.236/5/3) 2011-03-01 09:36 i686 Cygwin
/home/977315
>clisp --version
GNU CLISP 2.48 (2009-07-28) (built on ATGRZWN502840.avl01.avlcorp.lan [157.247.26.41])
Software: GNU C 4.3.4 20090804 (release) 1
gcc-4 -O2 -pipe  -g -W -Wswitch -Wcomment -Wpointer-arith -Wimplicit -Wreturn-type -Wmissing-declarations -Wno-sign-compare -Wno-format-nonliteral -O2 -fexpensive-optimizations -falign-functions=4 -DUNICODE -DDYNAMIC_FFI -I. -Wl,--stack,8388608 -Wl,--enable-auto-import  /usr/lib/libintl.dll.a /usr/lib/libiconv.dll.a /usr/lib/libreadline.dll.a -lncurses /usr/lib/libavcall.a /usr/lib/libcallback.a /usr/lib/libiconv.dll.a -L/usr/lib -lsigsegv
SAFETY=0 HEAPCODES STANDARD_HEAPCODES SPVW_PAGES SPVW_MIXED
libsigsegv 2.8
libiconv 1.13
libreadline 6.0
Features:
(READLINE REGEXP SYSCALLS I18N LOOP COMPILER CLOS MOP CLISP ANSI-CL COMMON-LISP
 LISP=CL INTERPRETER SOCKETS GENERIC-STREAMS LOGICAL-PATHNAMES SCREEN FFI
 GETTEXT UNICODE BASE-CHAR=CHARACTER PC386 UNIX CYGWIN)
C Modules: (clisp i18n syscalls regexp readline)
Installation directory: /usr/lib/clisp-2.48/
User language: ENGLISH
Machine: I686 (I686) WTTCA1068.us.tel.com [172.17.56.65]
/home/977315


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101355&aid=3416966&group_id=1355