diff -r d6970628b95f -r 03d7f885d5f2 mercurial/revsetlang.py
--- a/mercurial/revsetlang.py	Sat Apr 14 00:30:39 2018 +0900
+++ b/mercurial/revsetlang.py	Tue Apr 17 21:59:58 2018 +0900
@@ -89,6 +89,9 @@
     [('symbol', '@', 0), ('::', None, 1), ('end', None, 3)]
 
     '''
+    if not isinstance(program, bytes):
+        raise error.ProgrammingError('revset statement must be bytes, got %r'
+                                     % program)
     program = pycompat.bytestr(program)
     if syminitletters is None:
         syminitletters = _syminitletters
@@ -581,6 +584,8 @@
     elif c == 's':
         return _quote(arg)
     elif c == 'r':
+        if not isinstance(arg, bytes):
+            raise TypeError
         parse(arg) # make sure syntax errors are confined
         return '(%s)' % arg
     elif c == 'n':