Package: emacs
Version: 23.1.50.11

(This is the CVS HEAD version of emacs.)

I tried M-x gdb to run emacs under gdb.  The command line was

  gdb -i=mi ~/src/emacs/src/emacs

and I got the error '(json-object-format ":" 44).  Here is the backtrace:

Debugger entered--Lisp error: (json-object-format ":" 44)
  signal(json-object-format (":" 44))
  json-read-object()
  apply(json-read-object nil)
  json-read()
  json-read-object()
  apply(json-read-object nil)
  json-read()
  json-read-array()
  apply(json-read-array nil)
  json-read()
  json-read-object()
  apply(json-read-object nil)
  json-read()
  json-read-object()
  apply(json-read-object nil)
  json-read()
  json-partial-output("bkpt")
  gdb-breakpoints-list-handler-custom()
  gdb-breakpoints-list-handler()
  gdb-done-or-error("BreakpointTable={nr_rows=\"2\",nr_cols=\"6\",hdr=[{width=\"7\",alignment=\...
  gud-gdbmi-marker-filter("colhdr=\"Address\"},{width=\"40\",alignment=\"2\",col_name=\"what\",...
  apply(gud-gdbmi-marker-filter "colhdr=\"Address\"},{width=\"40\",alignment=\"2\",col_name=\"w...
  gud-marker-filter("colhdr=\"Address\"},{width=\"40\",alignment=\"2\",col_name=\"what\",colhdr...
  gud-filter(#<process gud-emacs> "colhdr=\"Address\"},{width=\"40\",alignment=\"2\",col_name=\...

The content of buffer *partial-output-emacs* is attached, evaluating

  (let ((json-array-type 'list)) (json-read))

reproduces the error.  The above expression is the last one of `json-partial-output'
in gdb-mi.el

Regards,
Guanpeng Xu

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