Don't require a ; on the last declaration in a block

corpus/declarations.txt

@@ -166,3 +166,21 @@ a {
     (selectors (tag_name))
     (block
       (declaration (property_name) (plain_value) (important)))))
+
+============================
+Declarations without trailing semicolons
+============================
+
+a {
+  b: c;
+  d: e
+}
+
+---
+
+(stylesheet
+  (rule_set
+    (selectors (tag_name))
+    (block
+      (declaration (property_name) (plain_value))
+      (declaration (property_name) (plain_value)))))

grammar.js

@@ -98,7 +98,11 @@ module.exports = grammar({
 
     selectors: $ => commaSep1($._selector),
 
-    block: $ => seq('{', repeat($._block_item), '}'),
+    block: $ => seq('{',
+      repeat($._block_item),
+      optional(alias($.last_declaration, $.declaration)),
+      '}'
+    ),
 
     _block_item: $ => choice(
       $.declaration,
@@ -191,6 +195,17 @@ module.exports = grammar({
       ';'
     )),
 
+    last_declaration: $ => prec(1, seq(
+      alias($.identifier, $.property_name),
+      ':',
+      $._value,
+      repeat(seq(
+        optional(','),
+        $._value
+      )),
+      optional($.important)
+    )),
+
     important: $ => '!important',
 
     // Media queries

src/grammar.json

@@ -393,6 +393,23 @@
             "name": "_block_item"
           }
         },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "ALIAS",
+              "content": {
+                "type": "SYMBOL",
+                "name": "last_declaration"
+              },
+              "named": true,
+              "value": "declaration"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "STRING",
           "value": "}"
@@ -926,6 +943,68 @@
         ]
       }
     },
+    "last_declaration": {
+      "type": "PREC",
+      "value": 1,
+      "content": {
+        "type": "SEQ",
+        "members": [
+          {
+            "type": "ALIAS",
+            "content": {
+              "type": "SYMBOL",
+              "name": "identifier"
+            },
+            "named": true,
+            "value": "property_name"
+          },
+          {
+            "type": "STRING",
+            "value": ":"
+          },
+          {
+            "type": "SYMBOL",
+            "name": "_value"
+          },
+          {
+            "type": "REPEAT",
+            "content": {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "STRING",
+                      "value": ","
+                    },
+                    {
+                      "type": "BLANK"
+                    }
+                  ]
+                },
+                {
+                  "type": "SYMBOL",
+                  "name": "_value"
+                }
+              ]
+            }
+          },
+          {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "important"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          }
+        ]
+      }
+    },
     "important": {
       "type": "STRING",
       "value": "!important"