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From: Noam Postavsky <npostavs@gmail.com>
To: Philipp Stephani <p.stephani2@gmail.com>
Cc: 40727@debbugs.gnu.org, Tino Calancha <tino.calancha@gmail.com>
Subject: bug#40727: 27.0.91; 'cl-loop ... across ... and' seems broken
Date: Thu, 30 Apr 2020 19:40:43 -0400	[thread overview]
Message-ID: <87v9lgmtj8.fsf@gmail.com> (raw)
In-Reply-To: <871ro5nojr.fsf@gmail.com> (Noam Postavsky's message of "Thu, 30 Apr 2020 08:30:48 -0400")

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Noam Postavsky <npostavs@gmail.com> writes:

> By the way, while adding the test case I found an additional regression
> involving loop termination by a 'var = ...' clause.  I'll open another
> bug about it soon.

Actually, it's very closely connected (only observable after fixing the
original bug, since otherwise the necessary conditions trigger the
--cl-vec-- is void error), so I'll keep it here.  When there is a
(cl-loop for VAR across ARRAY and VAR2 = ...) the array index would get
incremented twice per loop.  Fixed by the patch below (applies on top of
the patch in my previous message).


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From 62d4626a1684ec7fd7d560cdf75f1b6a5f726c37 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 30 Apr 2020 18:55:40 -0400
Subject: [PATCH 2/2] Don't increment array index in cl-loop twice (Bug#40727)

* lisp/emacs-lisp/cl-macs.el (cl--parse-loop-clause): Put the temp-idx
increment in cl--loop-body, leaving just the side-effect free testing
of the index for both cl--loop-body and cl--loop-conditions.
* test/lisp/emacs-lisp/cl-macs-tests.el (cl-macs-loop-and-arrays):
Extend test to cover this case.
---
 lisp/emacs-lisp/cl-macs.el            | 3 ++-
 test/lisp/emacs-lisp/cl-macs-tests.el | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 20bd1883c3..d6997ce0d2 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -1325,8 +1325,9 @@ cl--parse-loop-clause
 		      (temp-idx (make-symbol "--cl-idx--")))
 		  (push (list temp-vec (pop cl--loop-args)) loop-for-bindings)
 		  (push (list temp-idx -1) loop-for-bindings)
+                  (push `(setq ,temp-idx (1+ ,temp-idx)) cl--loop-body)
 		  (cl--push-clause-loop-body
-                   `(< (setq ,temp-idx (1+ ,temp-idx)) (length ,temp-vec)))
+                   `(< ,temp-idx (length ,temp-vec)))
 		  (if (eq word 'across-ref)
 		      (push (list var `(aref ,temp-vec ,temp-idx))
 			    cl--loop-symbol-macs)
diff --git a/test/lisp/emacs-lisp/cl-macs-tests.el b/test/lisp/emacs-lisp/cl-macs-tests.el
index 77609a42a9..983e79ac57 100644
--- a/test/lisp/emacs-lisp/cl-macs-tests.el
+++ b/test/lisp/emacs-lisp/cl-macs-tests.el
@@ -43,6 +43,9 @@ cl-macs-loop-and-arrays
   "Bug#40727"
   (should (equal (cl-loop for y = (- (or x 0)) and x across [1 2]
                           collect (cons x y))
+                 '((1 . 0) (2 . -1))))
+  (should (equal (cl-loop for x across [1 2] and y = (- (or x 0))
+                          collect (cons x y))
                  '((1 . 0) (2 . -1)))))
 
 (ert-deftest cl-macs-loop-destructure ()
-- 
2.11.0


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Eli, is it okay to push both of these to emacs-27?  Alternatively,
reverting both fixes to Bug#29799 in addition to the Bug#29866 fix
works:


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From 431d7ebc466163808535706cbb4929b25e5b4fbc Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 30 Apr 2020 19:33:34 -0400
Subject: [PATCH 1/4] Revert "Refix conditional step clauses in cl-loop"

This reverts commit 045cfbef09a67c334e4772cb045181cf2203d839.
---
 lisp/emacs-lisp/cl-macs.el | 96 ++++++++++++++++++++++++++++------------------
 1 file changed, 59 insertions(+), 37 deletions(-)

diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index d56f4151df..cda25d186f 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -889,7 +889,7 @@ cl-return-from
 ;;; The "cl-loop" macro.
 
 (defvar cl--loop-args) (defvar cl--loop-accum-var) (defvar cl--loop-accum-vars)
-(defvar cl--loop-bindings) (defvar cl--loop-body) (defvar cl--loop-conditions)
+(defvar cl--loop-bindings) (defvar cl--loop-body)
 (defvar cl--loop-finally)
 (defvar cl--loop-finish-flag)           ;Symbol set to nil to exit the loop?
 (defvar cl--loop-first-flag)
@@ -897,7 +897,7 @@ cl--loop-initially
 (defvar cl--loop-name)
 (defvar cl--loop-result) (defvar cl--loop-result-explicit)
 (defvar cl--loop-result-var) (defvar cl--loop-steps)
-(defvar cl--loop-symbol-macs)
+(defvar cl--loop-symbol-macs) (defvar cl--loop-guard-cond)
 
 (defun cl--loop-set-iterator-function (kind iterator)
   (if cl--loop-iterator-function
@@ -966,8 +966,7 @@ cl-loop
 	  (cl--loop-accum-var nil)	(cl--loop-accum-vars nil)
 	  (cl--loop-initially nil)	(cl--loop-finally nil)
 	  (cl--loop-iterator-function nil) (cl--loop-first-flag nil)
-          (cl--loop-symbol-macs nil)
-          (cl--loop-conditions nil))
+          (cl--loop-symbol-macs nil) (cl--loop-guard-cond nil))
       ;; Here is more or less how those dynbind vars are used after looping
       ;; over cl--parse-loop-clause:
       ;;
@@ -1002,7 +1001,24 @@ cl-loop
 			      (list (or cl--loop-result-explicit
                                         cl--loop-result))))
 	     (ands (cl--loop-build-ands (nreverse cl--loop-body)))
-	     (while-body (nconc (cadr ands) (nreverse cl--loop-steps)))
+	     (while-body
+              (nconc
+               (cadr ands)
+               (if (or (not cl--loop-guard-cond) (not cl--loop-first-flag))
+                   (nreverse cl--loop-steps)
+                 ;; Right after update the loop variable ensure that the loop
+                 ;; condition, i.e. (car ands), is still satisfied; otherwise,
+                 ;; set `cl--loop-first-flag' nil and skip the remaining
+                 ;; body forms (#Bug#29799).
+                 ;;
+                 ;; (last cl--loop-steps) updates the loop var
+                 ;; (car (butlast cl--loop-steps)) sets `cl--loop-first-flag' nil
+                 ;; (nreverse (cdr (butlast cl--loop-steps))) are the
+                 ;; remaining body forms.
+                 (append (last cl--loop-steps)
+                         `((and ,(car ands)
+                                ,@(nreverse (cdr (butlast cl--loop-steps)))))
+                         `(,(car (butlast cl--loop-steps)))))))
 	     (body (append
 		    (nreverse cl--loop-initially)
 		    (list (if cl--loop-iterator-function
@@ -1035,12 +1051,6 @@ cl-loop
                   (list `(cl-symbol-macrolet ,cl--loop-symbol-macs ,@body))))
 	`(cl-block ,cl--loop-name ,@body)))))
 
-(defmacro cl--push-clause-loop-body (clause)
-  "Apply CLAUSE to both `cl--loop-conditions' and `cl--loop-body'."
-  `(progn
-     (push ,clause cl--loop-conditions)
-     (push ,clause cl--loop-body)))
-
 ;; Below is a complete spec for cl-loop, in several parts that correspond
 ;; to the syntax given in CLtL2.  The specs do more than specify where
 ;; the forms are; it also specifies, as much as Edebug allows, all the
@@ -1191,6 +1201,8 @@ cl--push-clause-loop-body
 ;; (def-edebug-spec loop-d-type-spec
 ;;   (&or (loop-d-type-spec . [&or nil loop-d-type-spec]) cl-type-spec))
 
+
+
 (defun cl--parse-loop-clause ()		; uses loop-*
   (let ((word (pop cl--loop-args))
 	(hash-types '(hash-key hash-keys hash-value hash-values))
@@ -1269,11 +1281,11 @@ cl--parse-loop-clause
 		  (if end-var (push (list end-var end) loop-for-bindings))
 		  (if step-var (push (list step-var step)
 				     loop-for-bindings))
-		  (when end
-                    (cl--push-clause-loop-body
-                     (list
-                      (if down (if excl '> '>=) (if excl '< '<=))
-                      var (or end-var end))))
+		  (if end
+		      (push (list
+			     (if down (if excl '> '>=) (if excl '< '<=))
+			     var (or end-var end))
+                            cl--loop-body))
 		  (push (list var (list (if down '- '+) var
 					(or step-var step 1)))
 			loop-for-steps)))
@@ -1283,7 +1295,7 @@ cl--parse-loop-clause
 		       (temp (if (and on (symbolp var))
 				 var (make-symbol "--cl-var--"))))
 		  (push (list temp (pop cl--loop-args)) loop-for-bindings)
-                  (cl--push-clause-loop-body `(consp ,temp))
+		  (push `(consp ,temp) cl--loop-body)
 		  (if (eq word 'in-ref)
 		      (push (list var `(car ,temp)) cl--loop-symbol-macs)
 		    (or (eq temp var)
@@ -1306,19 +1318,24 @@ cl--parse-loop-clause
 	       ((eq word '=)
 		(let* ((start (pop cl--loop-args))
 		       (then (if (eq (car cl--loop-args) 'then)
-                                 (cl--pop2 cl--loop-args) start))
-                       (first-assign (or cl--loop-first-flag
-					 (setq cl--loop-first-flag
-					       (make-symbol "--cl-var--")))))
+                                 (cl--pop2 cl--loop-args) start)))
 		  (push (list var nil) loop-for-bindings)
 		  (if (or ands (eq (car cl--loop-args) 'and))
 		      (progn
-			(push `(,var (if ,first-assign ,start ,var)) loop-for-sets)
-			(push `(,var (if ,(car (cl--loop-build-ands
-                                                (nreverse cl--loop-conditions)))
-                                         ,then ,var))
-                              loop-for-steps))
-		    (push `(,var (if ,first-assign ,start ,then)) loop-for-sets))))
+			(push `(,var
+				(if ,(or cl--loop-first-flag
+					 (setq cl--loop-first-flag
+					       (make-symbol "--cl-var--")))
+				    ,start ,var))
+			      loop-for-sets)
+			(push (list var then) loop-for-steps))
+		    (push (list var
+				(if (eq start then) start
+				  `(if ,(or cl--loop-first-flag
+					    (setq cl--loop-first-flag
+						  (make-symbol "--cl-var--")))
+				       ,start ,then)))
+			  loop-for-sets))))
 
 	       ((memq word '(across across-ref))
 		(let ((temp-vec (make-symbol "--cl-vec--"))
@@ -1327,8 +1344,9 @@ cl--parse-loop-clause
 		  (push (list temp-vec (pop cl--loop-args)) loop-for-bindings)
 		  (push (list temp-len `(length ,temp-vec)) loop-for-bindings)
 		  (push (list temp-idx -1) loop-for-bindings)
-		  (cl--push-clause-loop-body
-                   `(< (setq ,temp-idx (1+ ,temp-idx)) ,temp-len))
+		  (push `(< (setq ,temp-idx (1+ ,temp-idx))
+                            ,temp-len)
+                        cl--loop-body)
 		  (if (eq word 'across-ref)
 		      (push (list var `(aref ,temp-vec ,temp-idx))
 			    cl--loop-symbol-macs)
@@ -1358,14 +1376,15 @@ cl--parse-loop-clause
 			      loop-for-bindings)
 			(push (list var `(elt ,temp-seq ,temp-idx))
 			      cl--loop-symbol-macs)
-			(cl--push-clause-loop-body `(< ,temp-idx ,temp-len)))
+			(push `(< ,temp-idx ,temp-len) cl--loop-body))
                     ;; Evaluate seq length just if needed, that is, when seq is not a cons.
                     (push (list temp-len (or (consp seq) `(length ,temp-seq)))
 			  loop-for-bindings)
 		    (push (list var nil) loop-for-bindings)
-		    (cl--push-clause-loop-body `(and ,temp-seq
-                                                     (or (consp ,temp-seq)
-                                                         (< ,temp-idx ,temp-len))))
+		    (push `(and ,temp-seq
+				(or (consp ,temp-seq)
+                                    (< ,temp-idx ,temp-len)))
+			  cl--loop-body)
 		    (push (list var `(if (consp ,temp-seq)
                                          (pop ,temp-seq)
                                        (aref ,temp-seq ,temp-idx)))
@@ -1461,8 +1480,9 @@ cl--parse-loop-clause
 		  (push (list var  '(selected-frame))
 			loop-for-bindings)
 		  (push (list temp nil) loop-for-bindings)
-		  (cl--push-clause-loop-body `(prog1 (not (eq ,var ,temp))
-                                                (or ,temp (setq ,temp ,var))))
+		  (push `(prog1 (not (eq ,var ,temp))
+                           (or ,temp (setq ,temp ,var)))
+			cl--loop-body)
 		  (push (list var `(next-frame ,var))
 			loop-for-steps)))
 
@@ -1483,8 +1503,9 @@ cl--parse-loop-clause
 		  (push (list minip `(minibufferp (window-buffer ,var)))
 			loop-for-bindings)
 		  (push (list temp nil) loop-for-bindings)
-		  (cl--push-clause-loop-body `(prog1 (not (eq ,var ,temp))
-                                                (or ,temp (setq ,temp ,var))))
+		  (push `(prog1 (not (eq ,var ,temp))
+                           (or ,temp (setq ,temp ,var)))
+			cl--loop-body)
 		  (push (list var `(next-window ,var ,minip))
 			loop-for-steps)))
 
@@ -1508,6 +1529,7 @@ cl--parse-loop-clause
                      t)
                   cl--loop-body))
 	(when loop-for-steps
+          (setq cl--loop-guard-cond t)
 	  (push (cons (if ands 'cl-psetq 'setq)
 		      (apply 'append (nreverse loop-for-steps)))
 		cl--loop-steps))))
-- 
2.11.0


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From 8982a0756c7fc4e1cffd3989509fd243989f946c Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 30 Apr 2020 19:33:50 -0400
Subject: [PATCH 2/4] Revert "cl-loop: Add missing guard condition"

This reverts commit a0365437c9ee308ad7978e436631020f513b25e7.
---
 lisp/emacs-lisp/cl-macs.el | 32 +++++++-------------------------
 1 file changed, 7 insertions(+), 25 deletions(-)

diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index cda25d186f..00f34d3fb6 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -897,7 +897,7 @@ cl--loop-initially
 (defvar cl--loop-name)
 (defvar cl--loop-result) (defvar cl--loop-result-explicit)
 (defvar cl--loop-result-var) (defvar cl--loop-steps)
-(defvar cl--loop-symbol-macs) (defvar cl--loop-guard-cond)
+(defvar cl--loop-symbol-macs)
 
 (defun cl--loop-set-iterator-function (kind iterator)
   (if cl--loop-iterator-function
@@ -966,7 +966,7 @@ cl-loop
 	  (cl--loop-accum-var nil)	(cl--loop-accum-vars nil)
 	  (cl--loop-initially nil)	(cl--loop-finally nil)
 	  (cl--loop-iterator-function nil) (cl--loop-first-flag nil)
-          (cl--loop-symbol-macs nil) (cl--loop-guard-cond nil))
+          (cl--loop-symbol-macs nil))
       ;; Here is more or less how those dynbind vars are used after looping
       ;; over cl--parse-loop-clause:
       ;;
@@ -1001,24 +1001,7 @@ cl-loop
 			      (list (or cl--loop-result-explicit
                                         cl--loop-result))))
 	     (ands (cl--loop-build-ands (nreverse cl--loop-body)))
-	     (while-body
-              (nconc
-               (cadr ands)
-               (if (or (not cl--loop-guard-cond) (not cl--loop-first-flag))
-                   (nreverse cl--loop-steps)
-                 ;; Right after update the loop variable ensure that the loop
-                 ;; condition, i.e. (car ands), is still satisfied; otherwise,
-                 ;; set `cl--loop-first-flag' nil and skip the remaining
-                 ;; body forms (#Bug#29799).
-                 ;;
-                 ;; (last cl--loop-steps) updates the loop var
-                 ;; (car (butlast cl--loop-steps)) sets `cl--loop-first-flag' nil
-                 ;; (nreverse (cdr (butlast cl--loop-steps))) are the
-                 ;; remaining body forms.
-                 (append (last cl--loop-steps)
-                         `((and ,(car ands)
-                                ,@(nreverse (cdr (butlast cl--loop-steps)))))
-                         `(,(car (butlast cl--loop-steps)))))))
+	     (while-body (nconc (cadr ands) (nreverse cl--loop-steps)))
 	     (body (append
 		    (nreverse cl--loop-initially)
 		    (list (if cl--loop-iterator-function
@@ -1528,11 +1511,10 @@ cl--parse-loop-clause
                      ,(cl--loop-let (nreverse loop-for-sets) 'setq ands)
                      t)
                   cl--loop-body))
-	(when loop-for-steps
-          (setq cl--loop-guard-cond t)
-	  (push (cons (if ands 'cl-psetq 'setq)
-		      (apply 'append (nreverse loop-for-steps)))
-		cl--loop-steps))))
+	(if loop-for-steps
+	    (push (cons (if ands 'cl-psetq 'setq)
+			(apply 'append (nreverse loop-for-steps)))
+		  cl--loop-steps))))
 
      ((eq word 'repeat)
       (let ((temp (make-symbol "--cl-var--")))
-- 
2.11.0


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From 338c67f58b80462b02620cf77f16cb11770786c0 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 30 Apr 2020 19:33:51 -0400
Subject: [PATCH 3/4] Revert "cl-loop: Calculate the array length just once"

This reverts commit bfca19e475c01f13dbacc7f8b7bb1aecf46cb7e4.
---
 lisp/emacs-lisp/cl-macs.el | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 00f34d3fb6..78d083fcc6 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -1322,13 +1322,11 @@ cl--parse-loop-clause
 
 	       ((memq word '(across across-ref))
 		(let ((temp-vec (make-symbol "--cl-vec--"))
-                      (temp-len (make-symbol "--cl-len--"))
 		      (temp-idx (make-symbol "--cl-idx--")))
 		  (push (list temp-vec (pop cl--loop-args)) loop-for-bindings)
-		  (push (list temp-len `(length ,temp-vec)) loop-for-bindings)
 		  (push (list temp-idx -1) loop-for-bindings)
 		  (push `(< (setq ,temp-idx (1+ ,temp-idx))
-                            ,temp-len)
+                            (length ,temp-vec))
                         cl--loop-body)
 		  (if (eq word 'across-ref)
 		      (push (list var `(aref ,temp-vec ,temp-idx))
@@ -1343,7 +1341,6 @@ cl--parse-loop-clause
 				    (error "Expected `of'"))))
 		      (seq (cl--pop2 cl--loop-args))
 		      (temp-seq (make-symbol "--cl-seq--"))
-	              (temp-len (make-symbol "--cl-len--"))
 		      (temp-idx
                        (if (eq (car cl--loop-args) 'using)
                            (if (and (= (length (cadr cl--loop-args)) 2)
@@ -1354,19 +1351,16 @@ cl--parse-loop-clause
 		  (push (list temp-seq seq) loop-for-bindings)
 		  (push (list temp-idx 0) loop-for-bindings)
 		  (if ref
-                      (progn
+		      (let ((temp-len (make-symbol "--cl-len--")))
 			(push (list temp-len `(length ,temp-seq))
 			      loop-for-bindings)
 			(push (list var `(elt ,temp-seq ,temp-idx))
 			      cl--loop-symbol-macs)
 			(push `(< ,temp-idx ,temp-len) cl--loop-body))
-                    ;; Evaluate seq length just if needed, that is, when seq is not a cons.
-                    (push (list temp-len (or (consp seq) `(length ,temp-seq)))
-			  loop-for-bindings)
 		    (push (list var nil) loop-for-bindings)
 		    (push `(and ,temp-seq
 				(or (consp ,temp-seq)
-                                    (< ,temp-idx ,temp-len)))
+                                    (< ,temp-idx (length ,temp-seq))))
 			  cl--loop-body)
 		    (push (list var `(if (consp ,temp-seq)
                                          (pop ,temp-seq)
-- 
2.11.0


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From 36c48b5c21278c0f42be31b7253bfed7f698b479 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 30 Apr 2020 19:35:45 -0400
Subject: [PATCH 4/4] ; Mark Bug#29799 tests as failing since we reverted the
 fix

* test/lisp/emacs-lisp/cl-macs-tests.el (cl-macs-loop-for-as-equals-and)
(cl-macs-loop-conditional-step-clauses): Set :expected-result to
:failed.
---
 test/lisp/emacs-lisp/cl-macs-tests.el | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/lisp/emacs-lisp/cl-macs-tests.el b/test/lisp/emacs-lisp/cl-macs-tests.el
index 9ca84f156a..c357ecde95 100644
--- a/test/lisp/emacs-lisp/cl-macs-tests.el
+++ b/test/lisp/emacs-lisp/cl-macs-tests.el
@@ -498,6 +498,7 @@ cl-macs-loop-vconcat
 
 (ert-deftest cl-macs-loop-for-as-equals-and ()
   "Test for https://debbugs.gnu.org/29799 ."
+  :expected-result :failed
   (let ((arr (make-vector 3 0)))
     (should (equal '((0 0) (1 1) (2 2))
                    (cl-loop for k below 3 for x = k and z = (elt arr k)
@@ -531,6 +532,7 @@ cl-macs-test--symbol-macrolet
 
 (ert-deftest cl-macs-loop-conditional-step-clauses ()
   "These tests failed under the initial fixes in #bug#29799."
+  :expected-result :failed
   (should (cl-loop for i from 1 upto 100 and j = 1 then (1+ j)
                    if (not (= i j))
                    return nil
-- 
2.11.0


  reply	other threads:[~2020-04-30 23:40 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-20  0:33 bug#40727: 27.0.91; 'cl-loop ... across ... and' seems broken Philipp Stephani
2020-04-30 12:30 ` Noam Postavsky
2020-04-30 23:40   ` Noam Postavsky [this message]
2020-05-01  6:11     ` Eli Zaretskii
2020-05-06  1:16       ` Noam Postavsky
2020-05-09 23:13         ` Philipp Stephani

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