add lifetime to Draw trait

examples/mode_02.rs

@@ -45,16 +45,20 @@ impl_keywords!(Tui, XYWH<u16>, State [
     kw_tui_bg
 ]);
 
-impl Interpret<Tui, Option<XYWH<u16>>> for State {
-    fn interpret_word (&self, to: &mut Tui, sym: &impl Language) -> Perhaps<XYWH<u16>> {
-        match sym.src()? {
+impl<'a> Interpret<'a, Tui, Option<XYWH<u16>>> for State {
+    fn interpret_word <L: Language<'a> + ?Sized> (&'a self, to: &mut Tui, lang: &'a L)
+        -> Drawn<'a, u16>
+    {
+        match lang.src()? {
             Some(":foo") => "foo".draw(to),
             Some(":bar") => "bar".draw(to),
             Some(":foobar") => "FOOBAR".draw(to),
             src => todo!("src: {src:?}")
         }
     }
-    fn interpret_expr (&self, to: &mut Tui, src: &impl Expression) -> Perhaps<XYWH<u16>> {
+    fn interpret_expr <L: Language<'a> + ?Sized> (&self, to: &mut Tui, src: &'a L)
+        -> Drawn<'a, u16>
+    {
         if let Some(area) = self.keyword(to, src)? {
             Ok(Some(area))
         } else {