$ hg init outer

  $ cd outer

  $ echo 'sub = http://example.net/libfoo' > .hgsub

  $ hg add .hgsub

  $ hg debugsub

  path sub

   source   http://example.net/libfoo

   revision 

  $ cat > .hg/hgrc <<EOF

  > [subpaths]

  > http://example.net = ssh://localhost

  > EOF

  $ hg debugsub

  path sub

   source   ssh://localhost/libfoo

   revision 

test bad subpaths pattern

  $ cat > .hg/hgrc <<EOF

  > [subpaths]

  > .* = \1

  > EOF

  $ hg debugsub

  abort: bad subrepository pattern in .*/test-subrepo-paths.t/outer/.hg/hgrc:2: invalid group reference

  $ exit 0