Stop signaling an error when reading "smart quotes" in symbols

Revert commits from 2018-01-28 "Fix round tripping of read->print for
symbols with strange quotes", and 2017-07-22 "Signal error for symbol
names with strange quotes (Bug#2967)".
* etc/NEWS: Remove corresponding entries.
* src/character.c (confusable_symbol_character_p):
* test/src/lread-tests.el (lread-tests--old-style-backquotes): Remove.
* src/lread.c (read1): Don't signal error on confusable character.
* src/print.c (print_object): Don't escape confusable characters.

1 files changed, 0 insertions, 17 deletions

diff --git a/test/src/lread-tests.el b/test/src/lread-tests.el
index 3a2212ef770..0c14a1afdaa 100644
--- a/test/src/lread-tests.el
+++ b/test/src/lread-tests.el
@@ -144,23 +144,6 @@ literals (Bug#20852)."
                            "`?\\\"', `?\\(', `?\\)', `?\\;', `?\\[', `?\\]' "
                            "expected!")))))
 
-(ert-deftest lread-tests--funny-quote-symbols ()
-  "Check that `smart quotes' or similar trigger errors in symbol names."
-  (dolist (quote-char
-           '(#x2018 ;; LEFT SINGLE QUOTATION MARK
-             #x2019 ;; RIGHT SINGLE QUOTATION MARK
-             #x201B ;; SINGLE HIGH-REVERSED-9 QUOTATION MARK
-             #x201C ;; LEFT DOUBLE QUOTATION MARK
-             #x201D ;; RIGHT DOUBLE QUOTATION MARK
-             #x201F ;; DOUBLE HIGH-REVERSED-9 QUOTATION MARK
-             #x301E ;; DOUBLE PRIME QUOTATION MARK
-             #xFF02 ;; FULLWIDTH QUOTATION MARK
-             #xFF07 ;; FULLWIDTH APOSTROPHE
-             ))
-    (let ((str (format "%cfoo" quote-char)))
-     (should-error (read str) :type 'invalid-read-syntax)
-     (should (eq (read (concat "\\" str)) (intern str))))))
-
 (ert-deftest lread-test-bug26837 ()
   "Test for https://debbugs.gnu.org/26837 ."
   (let ((load-path (cons