Fix type checking for anonymous functions

example/main.nub

@@ -2,23 +2,42 @@ namespace main
 
 struct Human {
     age: u64
-    print_age: func() = () => {
-        
+    print_age: func() = func() {
+        c::puts("pwp")
     }
 }
 
 export func main(args: []^string): i64 {
+    let x = 2
+
+    let uwu = func() {
+        c::puts("uwu")
+    }
+
+    uwu()
+
+    func() {
+        c::puts("owo")
+    }()
+
     let me = alloc Human {
         age = 23
     }
 
     me.print_age()
 
-    print_age()
+    if true {
+        // do something
+    }
+
+    c::puts("test")
+
+    let i = 1
+    while i <= 10 {
+        c::puts("test")
+        i = i + 1
+    }
+
 
     return 0
-}
-
-func print_age() {
-    c::puts("TEST")
 }