Stefan Guath <stefan@automata.se> writes:

> TO REPRODUCE BUG:
> * emacs -Q
> * Create two buffers (C-x b) with the following contents:
> foo.el: "idris0 idris1"
> bar.el: "ideal0 ideal1"
> * Go to end of foo.el, write "id" and execute dabbrev-completion (C-M-/)
>
> EXPECTED RESULT
> "id" should complete to "idris".

Hi, sorry it took so long for someone to look at this.

I believe the attached patch fixes it. The problem seems to have been
switching dabbrev.el over to using lexical scoping. It was previously
using let* to temporarily override a couple of global variables, which
works with dynamic scoping, but not lexical.