[Bug 4799] New: schemes extension fails when configured scheme ends in backslash

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4799

          Priority: normal
            Bug ID: 4799
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: schemes extension fails when configured scheme ends in
                    backslash
          Severity: bug
    Classification: Unclassified
                OS: Windows
          Reporter: simohe at besonet.ch
          Hardware: PC
            Status: UNCONFIRMED
           Version: 3.5
         Component: Mercurial
           Product: Mercurial

This hgrc configuration results in an abort message because the scheme
wbackslash ends in a backslash:
[extensions]
schemes =
[schemes]
wbackslash = G:\bla\

Failure message (doing all config in one command):

C:\Users\tests>hg --config extensions.schemes= --config
schemes.wbackslash=G:\bla\ id wbackslash://path/to/
** http://mercurial.selenic.com/wiki/BugTracker
** Python 2.7.9 (default, Dec 10 2014, 12:28:03) [MSC v.1500 64 bit (AMD64)]
** Mercurial Distributed SCM (Version 3.5+5)
** Erweiterungen geladen: schemes
Traceback (most recent call last):
  File "hg", line 49, in <module>
  File "mercurial\dispatch.pyo", line 30, in run
  File "mercurial\dispatch.pyo", line 92, in dispatch
  File "mercurial\dispatch.pyo", line 163, in _runcatch
  File "mercurial\dispatch.pyo", line 895, in _dispatch
  File "mercurial\dispatch.pyo", line 656, in runcommand
  File "mercurial\dispatch.pyo", line 1013, in _runcommand
  File "mercurial\dispatch.pyo", line 982, in checkargs
  File "mercurial\dispatch.pyo", line 892, in <lambda>
  File "mercurial\util.pyo", line 792, in check
  File "mercurial\commands.pyo", line 4027, in identify
  File "mercurial\hg.pyo", line 146, in peer
  File "mercurial\hg.pyo", line 123, in _peerorrepo
  File "hgext\schemes.pyo", line 80, in instance
  File "mercurial\templater.pyo", line 759, in process
  File "mercurial\templater.pyo", line 752, in _load
  File "mercurial\templater.pyo", line 174, in compiletemplate
  File "mercurial\templater.pyo", line 150, in _parsetemplate
ValueError: Trailing \ in string

Maybe the failure is expected, but the message does not tell a lot of useful
information.

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