add def implementation for lambdas

examples/benchmark.lisp

@@ -41,5 +41,7 @@
 ; Scope
 
   (def aaa 123)
-  (test "def" aaa 123)
+  (def addOne (lambda (a) (add a 1)))
+  (test "def - value" aaa 123)
+  (test "def - func" (addOne 4) 5)
 )

examples/include.lisp

@@ -1,3 +1,4 @@
 (
   (def value 12)
+  (def addOne (lambda (a) (add a 1)))
 )

examples/run.lisp

@@ -1 +1,7 @@
-(run "./include.lisp")
+(
+    (run "./include.lisp")
+
+    (echo value)
+
+    (echo (addOne value))
+)