Remove the apply-append-for-loop-to-for-loop lint (#441)

See jackfirst/resyntax#435; this lint tends to produce worse output
than the input it started with.

Author: pavpanchekha

default-recommendations/for-loop-shortcuts-test.rkt

@@ -643,25 +643,6 @@ test: "for-each and append-map can be replaced by for* with #:when"
 ------------------------------------------------------------
 
 
-test: "(apply append ...) with a for loop can be removed"
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(apply append
-       (for/list ([k (in-hash-keys formulas)])
-         (hash-ref formulas k)))
-------------------------------------------------------------
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(for*/list ([k (in-hash-keys formulas)]
-            [v (in-list (hash-ref formulas k))])
-  v)
-------------------------------------------------------------
-
-
 test: "(apply append ...) with a multi-clause for loop can't be removed"
 ------------------------------------------------------------
 (define formulas
@@ -686,46 +667,6 @@ test: "(apply append ...) with a multi-body for loop can't be removed"
 ------------------------------------------------------------
 
 
-test: "(apply append ...) with a for* loop can be removed"
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(apply append
-       (for*/list ([k (in-hash-keys formulas)])
-         (hash-ref formulas k)))
-------------------------------------------------------------
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(for*/list ([k (in-hash-keys formulas)]
-            [v (in-list (hash-ref formulas k))])
-  v)
-------------------------------------------------------------
-
-
-test: "(apply append ...) with a multi-clause for* loop can be removed"
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(apply append
-       (for*/list ([k (in-hash-keys formulas)]
-                   [i (in-range 0 5)])
-         (hash-ref formulas k)))
-------------------------------------------------------------
-------------------------------------------------------------
-(define formulas
-  (hash 'water (list 'hydrogen 'oxygen)
-        'benzene (list 'hydrogen 'carbon)))
-(for*/list ([k (in-hash-keys formulas)]
-            [i (in-range 0 5)]
-            [v (in-list (hash-ref formulas k))])
-  v)
-------------------------------------------------------------
-
-
 test: "(apply append ...) with a multi-body for* loop can't be removed"
 ------------------------------------------------------------
 (define formulas

default-recommendations/for-loop-shortcuts.rkt

@@ -424,30 +424,6 @@ return just that result."
    (~@ . (~splicing-replacement (last-condition.refactored ...) #:original original-body))))
 
 
-(define-syntax-class apply-append-refactorable-for-loop
-  #:attributes (refactored-loop)
-  #:literals (for/list for*/list)
-
-  (pattern (for/list (only-clause) only-body:expr)
-    #:when (oneline-syntax? #'only-body)
-    #:with refactored-loop
-    #'(for*/list (only-clause [v (in-list only-body)])
-        v))
-
-  (pattern ((~and loop-id for*/list) (clause ...) only-body:expr)
-    #:when (oneline-syntax? #'only-body)
-    #:with refactored-loop
-    #'(loop-id (clause ... [v (in-list only-body)]) v)))
-
-
-(define-refactoring-rule apply-append-for-loop-to-for-loop
-  #:description "Instead of using `(apply append ...)` to flatten a list of lists, consider using\
- `for*/list` to flatten the list."
-  #:literals (apply append)
-  (apply append loop:apply-append-refactorable-for-loop)
-  loop.refactored-loop)
-
-
 (define-refactoring-rule when-expression-in-for-loop-to-when-keyword
   #:description "Use the `#:when` keyword instead of `when` to reduce loop body indentation."
   #:literals (when for for*)
@@ -465,7 +441,6 @@ return just that result."
 (define-refactoring-suite for-loop-shortcuts
   #:rules (andmap-to-for/and
            append-map-for/list-to-for*/list
-           apply-append-for-loop-to-for-loop
            apply-plus-to-for/sum
            for/fold-building-hash-to-for/hash
            for/fold-result-keyword