diff -r defabf63e969 -r 8ff1ecfadcd1 mercurial/streamclone.py
--- a/mercurial/streamclone.py	Tue Oct 08 15:15:37 2019 -0700
+++ b/mercurial/streamclone.py	Tue Oct 08 15:06:18 2019 -0700
@@ -468,14 +468,14 @@
     """
     if len(repo):
         raise error.Abort(
-            _(b'cannot apply stream clone bundle on non-empty ' b'repo')
+            _(b'cannot apply stream clone bundle on non-empty repo')
         )
 
     filecount, bytecount, requirements = readbundle1header(fp)
     missingreqs = requirements - repo.supportedformats
     if missingreqs:
         raise error.Abort(
-            _(b'unable to apply stream clone: ' b'unsupported format: %s')
+            _(b'unable to apply stream clone: unsupported format: %s')
             % b', '.join(sorted(missingreqs))
         )
 
@@ -715,7 +715,7 @@
     missingreqs = [r for r in requirements if r not in repo.supported]
     if missingreqs:
         raise error.Abort(
-            _(b'unable to apply stream clone: ' b'unsupported format: %s')
+            _(b'unable to apply stream clone: unsupported format: %s')
             % b', '.join(sorted(missingreqs))
         )