cleanup: remove pointless r-prefixes on double-quoted strings This is only double-quoted strings. I'll do single-quoted strings as a second step. These had existed because our source transformer didn't turn r"" into b"", so we had tagged some strings as r-strings to get "native" strings on both Pythons. Now that the transformer is gone, we can dispense with this nonsense. Methodology: I ran hg locate 'set:added() or modified() or clean()' | egrep '.*\.py$' | xargs egrep --color=never -n -- \[\^a-z\]r\"\[\^\"\\\\\]\*\"\[\^\"\] in an emacs grep-mode buffer, and then used a keyboard macro to iterate over the results and remove the r prefix as needed. # skip-blame removing unneeded r prefixes left over from Python 3 migration. Differential Revision: https://phab.mercurial-scm.org/D7305

--- a/contrib/check-code.py	Thu Nov 07 03:59:22 2019 -0800
+++ b/contrib/check-code.py	Thu Nov 07 13:18:19 2019 -0500
@@ -281,10 +281,10 @@
     for tp in testpats[i]:
         p = tp[0]
         m = tp[1]
-        if p.startswith(r'^'):
-            p = r"^  [$>] (%s)" % p[1:]
+        if p.startswith('^'):
+            p = "^  [$>] (%s)" % p[1:]
         else:
-            p = r"^  [$>] .*(%s)" % p
+            p = "^  [$>] .*(%s)" % p
         utestpats[i].append((p, m) + tp[2:])
 
 # don't transform the following rules: