add reverse, snippet for prepend implementation

src/stl.rs

@@ -338,6 +338,39 @@ pub fn static_stdlib(syms: &mut SymTable) -> Result<(), String> {
         },
     );
 
+    syms.insert(
+        "pop".to_string(),
+        Symbol {
+            name: String::from("pop"),
+            args: Args::Strict(vec![Type::Seg]),
+            conditional_branches: false,
+            docs: append::POP_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(append::pop_callback)),
+        },
+    );
+
+    syms.insert(
+        "dq".to_string(),
+        Symbol {
+            name: String::from("dequeue"),
+            args: Args::Strict(vec![Type::Seg]),
+            conditional_branches: false,
+            docs: append::DEQUEUE_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(append::dequeue_callback)),
+        },
+    );
+
+    syms.insert(
+        "reverse".to_string(),
+        Symbol {
+            name: String::from("reverse"),
+            args: Args::Strict(vec![Type::Seg]),
+            conditional_branches: false,
+            docs: append::REVERSE_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(append::reverse_callback)),
+        },
+    );
+
     syms.insert(
         "exp".to_string(),
         Symbol {