Begin implementing while loops

corpus/while.txt

@@ -0,0 +1,52 @@
+==================
+While Loop
+==================
+
+while true {
+  (output "This is a bad idea...")
+}
+
+---
+
+(root
+  (item
+    (statement
+      (while
+        (expression
+          (value
+            (boolean)))
+        (statement
+          (expression
+            (tool_call
+              (output
+                (expression
+                  (value
+                    (string)))))))))))
+
+==================
+While Assignment
+==================
+
+foo = while true {
+  42
+}
+
+---
+
+(root
+  (item
+    (statement
+      (assignment
+        (identifier)
+        (statement
+          (while
+            (expression
+              (value
+                (boolean)))
+            (statement
+              (expression
+                (tool_call
+                  (output
+                    (expression
+                      (value
+                        (string)))))))))))))

grammar.js

@@ -22,6 +22,7 @@ module.exports = grammar({
       $.select,
       $.loop,
       $.match,
+      $.while,
     ),
   
     yield: $ => seq(

src/grammar.json

@@ -69,6 +69,10 @@
         {
           "type": "SYMBOL",
           "name": "match"
+        },
+        {
+          "type": "SYMBOL",
+          "name": "while"
         }
       ]
     },

src/node-types.json

@@ -382,6 +382,10 @@
           "type": "select",
           "named": true
         },
+        {
+          "type": "while",
+          "named": true
+        },
         {
           "type": "yield",
           "named": true
@@ -470,6 +474,25 @@
       ]
     }
   },
+  {
+    "type": "while",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        },
+        {
+          "type": "statement",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "yield",
     "named": true,