Add support for the explicit partial application syntax

Author: Emilios1995

grammar.js

@@ -733,6 +733,7 @@ module.exports = grammar({
       '(',
       optional($.uncurry),
       optional(commaSep1t($._call_argument)),
+      optional($.partial_application_spread),
       ')'
     ),
 
@@ -744,6 +745,8 @@ module.exports = grammar({
       $.labeled_argument,
     ),
 
+    partial_application_spread: $ => "...",
+
     labeled_argument: $ => seq(
       '~',
       field('label', $.value_identifier),

test/corpus/expressions.txt

@@ -111,6 +111,7 @@ blocky(
   ~third={3},
 )
 f(raise)
+f(1, ...)
 
 --------------------------------------------------------------------------------
 
@@ -191,7 +192,13 @@ f(raise)
     (call_expression
       function: (value_identifier)
       arguments: (arguments
-        (value_identifier)))))
+        (value_identifier))))
+  (expression_statement
+    (call_expression
+      function: (value_identifier)
+      arguments: (arguments
+        (number)
+        (partial_application_spread)))))
 
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 Pipe