releasenotes: mention changeset with warning and abort

Output the changeset hash with the warning/abort message just to know where things messed up.

Differential Revision: https://phab.mercurial-scm.org/D2253

hgext/releasenotes.py

@@ -311,8 +311,8 b' def parsenotesfromrevisions(repo, direct'
             title = block['lines'][0].strip() if block['lines'] else None
 
             if i + 1 == len(blocks):
-                raise error.Abort(_('release notes directive %s lacks content')
-                                  % directive)
+                raise error.Abort(_('changeset %s: release notes directive %s '
+                        'lacks content') % (ctx, directive))
 
             # Now search ahead and find all paragraphs attached to this
             # admonition.
@@ -325,8 +325,8 b' def parsenotesfromrevisions(repo, direct'
                     continue
 
                 if pblock['type'] != 'paragraph':
-                    repo.ui.warn(_('unexpected block in release notes '
-                                        'directive %s\n') % directive)
+                    repo.ui.warn(_('changeset %s: unexpected block in release '
+                        'notes directive %s\n') % (ctx, directive))
 
                 if pblock['indent'] > 0:
                     paragraphs.append(pblock['lines'])

tests/test-releasenotes-parsing.t

@@ -193,7 +193,7 b' Warn user in case of unexpected block wh'
   > EOF
 
   $ hg releasenote -r .
-  unexpected block in release notes directive feature
+  changeset a4251905c440: unexpected block in release notes directive feature
   New Features
   ============