+> (yield) operator and nice debug output!

examples/mini.it

@@ -0,0 +1,25 @@
+from textual.app import App, ComposeResult
+from textual.widgets import Header, Footer, TextArea
+
+class Mini(App):
+    """A Textual app to manage stopwatches."""
+
+    BINDINGS = [("ctrl+o", "open", "Open"), ("ctrl+s", "save", "Save"), ("ctrl+alt+s", "save_as", "Save as")]
+
+    def compose(self) -> ComposeResult:
+        """Create child widgets for the app."""
+        +> Header()
+        +> TextArea()
+        +> Footer()
+
+    def action_save(self) -> None:
+        """An action to save."""
+        pass
+    
+    def action_open(self) -> None: pass
+    def action_save_as(self) -> None: pass
+
+
+if __name__ == "__main__":
+    app = Mini()
+    app.run()