bug#33614: reposurgeon build is broken

[Danny Milosavljevic]

  class OrderedSet(collections.MutableSet):
=== Testing mailbox-out/mailbox-in roundtripping:
  authormatch.fi
/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon:13680: 
DeprecationWarning: Using or importing the ABCs from 'collections' instead of 
from 'collections.abc' is deprecated, and in 3.8 it will stop working
  class OrderedSet(collections.MutableSet):
Traceback (most recent call last):
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 1585, in f
    if len(cache) <= pos: cache.append(next(it))
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 13800, in <module>
    main()
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 13790, in main
    cmd.Cmd.onecmd(interpreter, interpreter.precmd(arg))
  File 
"/gnu/store/b7fqhszxl02g6pfm3vw6b3cjz472qrly-python-3.7.0/lib/python3.7/cmd.py",
 line 217, in onecmd
    return func(arg)
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 10761, in do_edit
    self.edit(self.selection, line)
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 9339, in edit
    self.do_mailbox_in("<" + tfname)
  File "/tmp/guix-build-reposurgeon-3.43.drv-0/reposurgeon-3.43/reposurgeon", 
line 10580, in do_mailbox_in
    for commit in self.chosen().commits():
RuntimeError: generator raised StopIteration
make[2]: *** [Makefile:90: mailboxing] Error 1
make[1]: *** [Makefile:24: default] Error 2
make: *** [Makefile:120: check] Error 2

Test suite failed, dumping logs.
Backtrace:
           4 (primitive-load "/gnu/store/k4qpksv3j8yljcb89lc228h78l6â¦")
In ice-9/eval.scm:
   191:35  3 (_ _)
In srfi/srfi-1.scm:
   863:16  2 (every1 #<procedure 80f2c0 at /gnu/store/gfprsx2m62cvqâ¦> â¦)
In 
/gnu/store/gfprsx2m62cvqbh7ysc9ay9slhijvmal-module-import/guix/build/gnu-build-system.scm:
   799:28  1 (_ _)
    369:6  0 (check #:target _ #:make-flags _ #:tests? _ # _ # _ # _)

/gnu/store/gfprsx2m62cvqbh7ysc9ay9slhijvmal-module-import/guix/build/gnu-build-system.scm:369:6:
 In procedure check:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: "make" 
arguments: ("check" "-j" "4" "ECHO=echo" 
"target=/gnu/store/0n2bv0yajwi7a8p3dg390i974ja2ldhl-reposurgeon-3.43") 
exit-status: 2 term-signal: #f stop-signal: #f] 96ca80>)'.

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