Add @let statement support

grammar.js

@@ -199,6 +199,7 @@ module.exports = grammar({
     // Control flow
     template_control_flow: ($) =>
       choice(
+        $.let_statement,
         $.if_statement,
         $.for_loop,
         $.match_statement,
@@ -206,6 +207,10 @@ module.exports = grammar({
         $.continue_statement,
       ),
 
+    // Let binding: @let name = expression
+    let_statement: ($) =>
+      seq("@let", $.pattern, "=", $.expression),
+
     if_statement: ($) =>
       seq(
         "@if",

queries/highlights.scm

@@ -13,6 +13,7 @@
 "@struct" @keyword
 "@enum" @keyword
 "@func" @keyword
+"@let" @keyword
 "@if" @keyword
 "@for" @keyword
 "@match" @keyword

src/grammar.json

@@ -975,6 +975,10 @@
     "template_control_flow": {
       "type": "CHOICE",
       "members": [
+        {
+          "type": "SYMBOL",
+          "name": "let_statement"
+        },
         {
           "type": "SYMBOL",
           "name": "if_statement"
@@ -997,6 +1001,27 @@
         }
       ]
     },
+    "let_statement": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "@let"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "pattern"
+        },
+        {
+          "type": "STRING",
+          "value": "="
+        },
+        {
+          "type": "SYMBOL",
+          "name": "expression"
+        }
+      ]
+    },
     "if_statement": {
       "type": "SEQ",
       "members": [

src/node-types.json

@@ -826,6 +826,25 @@
     "named": true,
     "fields": {}
   },
+  {
+    "type": "let_statement",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        },
+        {
+          "type": "pattern",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "literal",
     "named": true,
@@ -1418,6 +1437,10 @@
           "type": "if_statement",
           "named": true
         },
+        {
+          "type": "let_statement",
+          "named": true
+        },
         {
           "type": "match_statement",
           "named": true
@@ -1802,6 +1825,10 @@
     "type": "@import",
     "named": false
   },
+  {
+    "type": "@let",
+    "named": false
+  },
   {
     "type": "@match",
     "named": false