Add asynchronous attribute

Author: ZedThree

grammar.js

@@ -969,6 +969,7 @@ module.exports = grammar({
     _standalone_type_qualifier: $ => choice(
       caseInsensitive('abstract'),
       caseInsensitive('allocatable'),
+      caseInsensitive('asynchronous'),
       caseInsensitive('automatic'),
       prec.right(seq(
         caseInsensitive('codimension'),
@@ -2239,6 +2240,7 @@ module.exports = grammar({
     identifier: $ => choice(
       /[a-zA-Z_$][\w$]*/,
       caseInsensitive('allocatable'),
+      caseInsensitive('asynchronous'),
       caseInsensitive('automatic'),
       caseInsensitive('block'),
       caseInsensitive('byte'),

src/grammar.json

@@ -12247,6 +12247,15 @@
           "named": false,
           "value": "allocatable"
         },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "PATTERN",
+            "value": "[aA][sS][yY][nN][cC][hH][rR][oO][nN][oO][uU][sS]"
+          },
+          "named": false,
+          "value": "asynchronous"
+        },
         {
           "type": "ALIAS",
           "content": {
@@ -20733,6 +20742,15 @@
           "named": false,
           "value": "allocatable"
         },
+        {
+          "type": "ALIAS",
+          "content": {
+            "type": "PATTERN",
+            "value": "[aA][sS][yY][nN][cC][hH][rR][oO][nN][oO][uU][sS]"
+          },
+          "named": false,
+          "value": "asynchronous"
+        },
         {
           "type": "ALIAS",
           "content": {

src/node-types.json

@@ -7062,6 +7062,10 @@
     "type": "assumed_rank",
     "named": true
   },
+  {
+    "type": "asynchronous",
+    "named": false
+  },
   {
     "type": "attributes",
     "named": false