added iterator into prelude

Author: jkingstonc

README.md

@@ -16,7 +16,7 @@ print(vecs)
 
 ### Bugs
 
-- struct access is still random
+- struct constructor is still random
 - print function calls just aren't executing
 
 ### Non functional features

example/test.gila

@@ -5,19 +5,16 @@
 std = import std
 p = std.io.print
 
-Iterator type
-    counter: u32
-    limit: u32
-end
-
-__iter fn(self: Iterator)
-    // self.counter = self.counter + 1
-end
-
 i = Iterator(0,10)
-// i.__iter()
-
-
-// why is this print not working!!!
-
-std.io.print(i.counter)
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+res = i.__iter()
+
+std.io.print(res)

prelude/prelude.gila

@@ -3,17 +3,25 @@ Error type
     msg: string
 end
 
-
-// Result = type $T | Error end
-
-Result type
-  is_ok: bool
-end
-
-
 // what this gets compiled to is
 // __result = my_fn()
 // if !__result.is_ok
 //   return __result
 // end
 // r = __result.data
+//
+// Eventually we may want an algebraic data type like so
+// Result = type $T | Error end
+Result type
+  is_ok: bool
+end
+
+Iterator type
+    counter: u32
+    limit: u32
+end
+
+__iter fn(self: Iterator) -> bool
+    self.counter = self.counter + 1
+    return self.counter == self.limit
+end