# HG changeset patch
# User Matt Harbison <matt_harbison@yahoo.com>
# Date 2021-03-11 22:16:29
# Node ID 7e02e7c721b043bd7b25125521f00c36e74a920b
# Parent  83ffc49f7e48c2d4e5217aca932b39208269c0bd

grep: convert an exception to bytes for a warning message

Caught by pytype:

    File "/mnt/c/Users/Matt/hg/mercurial/commands.py", line 3457, in grep: Function _bytestr.__init__ was called with the wrong arguments [wrong-arg-types]
             Expected: (self, ints: Iterable[int])
      Actually passed: (self, ints: re.error)
      The following methods aren't implemented on re.error:
      __iter__

Differential Revision: https://phab.mercurial-scm.org/D10173

diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -3444,7 +3444,8 @@ def grep(ui, repo, pattern, *pats, **opt
         regexp = util.re.compile(pattern, reflags)
     except re.error as inst:
         ui.warn(
-            _(b"grep: invalid match pattern: %s\n") % pycompat.bytestr(inst)
+            _(b"grep: invalid match pattern: %s\n")
+            % stringutil.forcebytestr(inst)
         )
         return 1
     sep, eol = b':', b'\n'