Add more reserved words (#812)

* Add more reserved words

* `while`

Author: lens0021

src/modules/variable/mod.rs

@@ -24,15 +24,15 @@ pub fn variable_name_keywords() -> Vec<&'static str> {
         // Control flow keywords
         "if", "then", "else",
         // Loop keywords
-        "for", "loop", "break", "continue", "in",
+        "for", "loop", "break", "continue", "in", "while",
         // Module keywords
         "pub", "import", "from",
         // Function keywords
-        "fun", "return", "ref", "fail", "failed",
+        "fun", "return", "ref", "fail", "failed", "succeeded", "then",
         // Types
         "Text", "Number", "Bool", "Null",
         // Command Modifiers
-        "silent", "trust",
+        "silent", "trust", "sudo",
         // Misc
         "echo", "status", "nameof", "mv", "cd",
         "exit", "len",