proper error handling

src/main.rs

@@ -1,4 +1,5 @@
 use gtk::{
+    glib::BoolError,
     prelude::{FrameExt, OrientableExt, ScrolledWindowExt, TextBufferExt, TextViewExt, WidgetExt},
     Inhibit,
     Orientation,
@@ -8,9 +9,8 @@ use gtk::{
 use relm::{connect, Relm, Widget};
 use relm_derive::{widget, Msg};
 
-fn main() {
-    let res = Win::run(());
-    let _ = dbg!(res);
+fn main() -> Result<(), BoolError> {
+    Win::run(())
 }
 
 pub struct Model {