# HG changeset patch
# User Jason R. Coombs <jaraco@jaraco.com>
# Date 1662577005 14400
# Node ID 4367c46a89eeaa7000a08cf595d0b6bc3a06e712
# Parent  c6a1beba27e9fd5590f128e1abca4ee22cb60142
requires: re-use vfs.tryread for simplicity

Avoids calling `set` twice or having to re-raise an exception and implements the routine with a single return expression.

diff -r c6a1beba27e9 -r 4367c46a89ee mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Aug 30 15:29:55 2022 -0400
+++ b/mercurial/localrepo.py	Wed Sep 07 14:56:45 2022 -0400
@@ -522,12 +522,8 @@
     # the repository. This file was introduced in Mercurial 0.9.2,
     # which means very old repositories may not have one. We assume
     # a missing file translates to no requirements.
-    try:
-        return set(vfs.read(b'requires').splitlines())
-    except FileNotFoundError:
-        if not allowmissing:
-            raise
-        return set()
+    read = vfs.tryread if allowmissing else vfs.read
+    return set(read(b'requires').splitlines())
 
 
 def makelocalrepository(baseui, path, intents=None):