--- a/mercurial/debugcommands.py Fri May 04 15:00:55 2018 +0200
+++ b/mercurial/debugcommands.py Thu Apr 19 07:57:06 2018 +0200
@@ -629,6 +629,8 @@
opts = pycompat.byteskwargs(opts)
r = cmdutil.openrevlog(repo, 'debugdeltachain', file_, opts)
index = r.index
+ start = r.start
+ length = r.length
generaldelta = r.version & revlog.FLAG_GENERALDELTA
withsparseread = getattr(r, '_withsparseread', False)
@@ -676,8 +678,6 @@
comp, uncomp, deltatype, chain, chainsize = revinfo(rev)
chainbase = chain[0]
chainid = chainbases.setdefault(chainbase, len(chainbases) + 1)
- start = r.start
- length = r.length
basestart = start(chainbase)
revstart = start(rev)
lineardist = revstart + comp - basestart