Tags, enclosed proc results and better error handling

src/test.odin

@@ -1,15 +1,7 @@
-type Vec2: struct {
-	x, y: f32;
-}
-
-print_string_array :: proc(args: []string) {
-	args[0] = "";
-}
-
 main :: proc() {
-	x := 0;
+	x : u8 = 0;
 
-	thing :: proc(n: int) -> int, f32 {
+	thing :: proc(n: int) -> (int, f32) {
 		return n*n, 13.37;
 	}