`yank` or `recover-this-file' cause Emacs freeze

[deftsp]

Here is how to reproduce it:

By recover

1. Put following two files into the same directory.
2. Open Models.hs, Emacs will warning 'Model.hs has auto save data; consider M-x recover-this-file'
3. M-x recover-this-file. then Emacs freeze

by yank with example init.el config file

Just copy the content of #Models.hs# , and yank to Model.hs.

Model.hs

data FooType = A | B | C

Model.hs

data FooType = A | B | C
                   deriving (Show, Read, Eq, Enum, Bounded)
derivePersistField                            

ENV:

• OS X 10.8.4
• both Emacs 24.3 release and trunk 113419
• haskell-mode 3d6abf1
• without any config, just load "haskell-mode-autoloads.el"

I found this bug when I use `hippie-expand' to auto complete, and Emacs freeze. > Then I restart, recover it, freeze again.

I have turned on debug-on-quit, and press 'C-g' when freeze happen but nothing > happen.

Please let me know if needing more testing.

[hvr]

I just tried with Emacs 24.2.1/Linux but couldn't reproduce (yet). I'll try again later with a different Emacs version.

...could you test, whether this occurs with the release tagged haskell-mode v13.07 as well?

[deftsp]

@hvr tag v13.07 still have that problem. tag v13.06 fail to make. but tag 2_9_1 is OK.

[deftsp]

I did a debug, it is caused by font lock, to reproduce, just open the file with following content.

foo
                                            -> [[Text]]

It works on both Emacs 24.3 release and trunk 113566