bug#25716: 26.0.50; Invalid byte opcode: op=0, ptr=30

[Tino Calancha <tino.calancha@gmail.com>]

Mark Oteiza <mvoteiza@udel.edu> writes:

>>From -Q:
>
> 1. C-x C-f some/patch.diff RET
> 2. M-n
>
>   Error running timer: (error "Invalid byte opcode: op=0, ptr=30")
>
> In GNU Emacs 26.0.50.1 (x86_64-unknown-linux-gnu, X toolkit, Xaw scroll bars)
>  of 2017-02-13 built on logos
> Repository revision: fffd4ffd747fe46bb7849a874e4ae265b6eda54e
it might be cause by the new switch byte-code
(commit 88549ec38e9bb30e338a9985d0de4e6263b40fb7)

Save the definition of `diff-refine-hunk'
in a file:
/tmp/diff-refine-hunk.el

I)
    M-: (load "/tmp/diff-refine-hunk.el") RET
    ;; `diff-hunk-next' works as expected, i.e. with auto refinement.
II)
    M-: (byte-compile-file "/tmp/diff-refine-hunk.el") RET
    M-: (load "/tmp/diff-refine-hunk.elc") RET
    ;; `diff-hunk-next' doesn't auto refine and it shows
    ;; error "Variable binding depth exceeds max-specpdl-size".

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
In GNU Emacs 26.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.7)
 of 2017-02-14 built on calancha-pc
Repository revision: 31b4d9a13741caae2422636d4944212e702b19c3