# HG changeset patch
# User Yuya Nishihara <yuya@tcha.org>
# Date 2019-11-16 06:43:21
# Node ID 7cf332318f62f0e79c45a1c1e5cf0a0276bd00bb
# Parent  52e4bfebc4ba0ae7a050aea277cb3c72c3cd0cad

encoding: make getcols() raise exception explicitly

This helps pytype.

  File "mercurial/encoding.py", line 329, in getcols: bad option in return
  type [bad-return-type]
  Expected: bytes
  Actually returned: None

diff --git a/mercurial/encoding.py b/mercurial/encoding.py
--- a/mercurial/encoding.py
+++ b/mercurial/encoding.py
@@ -327,6 +327,7 @@ def getcols(s, start, c):
         t = s[start:x]
         if colwidth(t) == c:
             return t
+    raise ValueError('substring not found')
 
 
 def trim(s, width, ellipsis=b'', leftside=False):