Add 'use_assignment' and 'use_assignments' nodes under 'use'

Previously the 'use' node would have many 'identifier' or pattern nodes
and, with the parent commit, types as well. This change should make it
easier to figure out which children nodes of 'use' are associated with
one another.

Co-authored-by: Jonathan Arnett <jonarnett90@gmail.com>

grammar.js

@@ -448,10 +448,12 @@ module.exports = grammar({
     use: ($) =>
       seq(
         "use",
-        optional(series_of(seq($._pattern, optional($._type_annotation)), ",")),
+        optional(field("assignments", $.use_assignments)),
         "<-",
         field("value", $._expression)
       ),
+    use_assignments: ($) => series_of($.use_assignment, ","),
+    use_assignment: ($) => seq($._pattern, optional($._type_annotation)),
     assert: ($) => seq("assert", $._assignment),
     boolean_negation: ($) => seq("!", $._expression_unit),
     integer_negation: ($) => seq("-", $._expression_unit),

test/corpus/statements.txt

@@ -20,28 +20,40 @@ use x : OfType <- f()
       (identifier)
       (arguments)))
   (use
-    (identifier)
+    (use_assignments
+      (use_assignment
+        (identifier)))
     (function_call
       (identifier)
       (arguments)))
   (use
-    (identifier)
-    (identifier)
-    (identifier)
-    (identifier)
-    (identifier)
+    (use_assignments
+      (use_assignment
+        (identifier))
+      (use_assignment
+        (identifier))
+      (use_assignment
+        (identifier))
+      (use_assignment
+        (identifier))
+      (use_assignment
+        (identifier)))
     (function_call
       (identifier)
       (arguments)))
   (use
-    (tuple_pattern
-      (identifier)
-      (identifier))
+    (use_assignments
+      (use_assignment
+        (tuple_pattern
+          (identifier)
+          (identifier))))
     (identifier))
   (use
-    (identifier)
-    (type
-      (type_identifier))
-    (function_call
+    (use_assignments
+      (use_assignment
         (identifier)
-        (arguments))))
+        (type
+          (type_identifier))))
+    (function_call
+      (identifier)
+      (arguments))))