Add bubblesort example

TODO

@@ -1,8 +1,7 @@
 # Bugs
-
+- Uninitialized variables don't compile
 
 # Features 
-- Array access syntax
 - For loop
 - Type system
 - Nested expressions like (1 + (2 * 2))

examples/bubblesort.sb

@@ -0,0 +1,25 @@
+// Doesn't compile yet
+
+fn main() {
+    let arr = [2, 5, 3, 1, 4]
+    let n = len(arr)
+
+    let c = 0
+    while c < n {
+        let d = 0
+        while d < n - c - 1 {
+            let current = arr[d]
+            let next = arr[d+1]
+            if current > next {
+                let swap = arr[d]
+                arr[d]   = arr[d+1]
+                arr[d+1] = swap
+            }
+
+            d = d + 1
+        }
+
+        c = c + 1
+    }
+
+}

src/parser/tests.rs

@@ -484,3 +484,49 @@ fn test_array_access_standalone() {
     let tree = parse(tokens, Some(raw.to_string()));
     assert!(tree.is_ok())
 }
+
+#[test]
+fn test_array_access_assignment() {
+    let raw = "
+    fn main() {
+        let arr = [1, 2, 3]
+        let x = arr[0]
+
+        return x
+    }
+    ";
+    let tokens = tokenize(raw);
+    let tree = parse(tokens, Some(raw.to_string()));
+    assert!(tree.is_ok())
+}
+
+#[test]
+#[ignore]
+fn test_array_access_in_if() {
+    let raw = "
+    fn main() {
+        if arr[d] > arr[d+1] {
+            let swap = arr[d]
+            arr[d]   = arr[d+1]
+            arr[d+1] = swap
+        }
+    }
+    ";
+    let tokens = tokenize(raw);
+    let tree = parse(tokens, Some(raw.to_string()));
+    assert!(tree.is_ok())
+}
+
+#[test]
+#[ignore]
+fn test_uninitialized_variables() {
+    let raw = "
+    fn main() {
+        let x
+        let y
+    }
+    ";
+    let tokens = tokenize(raw);
+    let tree = parse(tokens, Some(raw.to_string()));
+    assert!(tree.is_ok())
+}