Revert "Allow zero-argument rx `or' and `seq' forms"

This reverts commit b552fc05c231ca6800330a318d3a74ddd0f5a13c.
It caused a bootstrapping failure which I have yet to resolve - sorry.

1 files changed, 0 insertions, 6 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 72702a9aaac..9ca98c370e6 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1321,12 +1321,6 @@ when given in a string.  Previously, '(any "\x80-\xff")' would match
 characters U+0080...U+00FF.  Now the expression matches raw bytes in
 the 128...255 range, as expected.
 
-*** The rx 'or' and 'seq' forms no longer require any arguments.
-(or) produces a regexp that never matches anything, while (seq)
-matches the empty string, each being an identity for the operation.
-This also works for their aliases: '|' for 'or'; ':', 'and' and
-'sequence' for 'seq'.
-
 ** Frames
 
 +++