Bug or incompatible change of byte-compile-file?

[Yasuhiro KIMURA]

Hello,

After update to commit fda9a2bbfd of master, build of some
3rd party applications fail such as following.

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if test "emacs" != "no"; then \
  am__dir=. am__subdir_includes=''; \
  case cannarpc.elc in */*) \
    am__dir=`echo 'cannarpc.elc' | sed 's,/[^/]*$,,'`; \
    am__subdir_includes="-L $am__dir -L ./$am__dir"; \
  esac; \
  test -d "$am__dir" || /usr/bin/mkdir -p "$am__dir" || exit 1; \
  emacs --batch \
    -q -no-site-file -no-init-file --eval="(setq load-path (append (list 
(expand-file-name \"..\")) load-path))" --eval="(load \"docomp.el\")"  \
    $am__subdir_includes -L . -L . \
    --eval "(defun byte-compile-dest-file (f) \"cannarpc.elc\")" \
    --eval "(unless (byte-compile-file \"cannarpc.el\") (kill-emacs 1))"; \
else :; fi
Loading c:/Users/yasu/Work/Emacs/master/tamago/docomp.el (source)...
Package cl is deprecated
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  file-writable-p(nil)
  byte-compile-file("cannarpc.el")
  (if (byte-compile-file "cannarpc.el") nil (kill-emacs 1))
  (unless (byte-compile-file "cannarpc.el") (kill-emacs 1))
  eval((unless (byte-compile-file "cannarpc.el") (kill-emacs 1)) t)
  command-line-1(("--eval=(setq load-path (append (list (expand-file-..." 
"--eval=(load \"docomp.el\")" "-L" "." "-L" "." "--eval" "(defun 
byte-compile-dest-file (f) \"cannarpc.elc\")" "--eval" "(unless 
(byte-compile-file \"cannarpc.el\") (kill-em..."))
  command-line()
  normal-top-level()

make[2]: *** [Makefile:315: cannarpc.elc] Error 127
make[2]: Leaving directory '/c/Users/yasu/Work/Emacs/master/tamago/egg'
make[1]: *** [Makefile:489: all-recursive] Error 1
make[1]: Leaving directory '/c/Users/yasu/Work/Emacs/master/tamago'
make: *** [Makefile:361: all] Error 2
----------------------------------------------------------------------

Is this bug or incompatible change of byte-compile-file?

Best Regards.

---
Yasuhiro KIMURA