style: remove clippy warnings

src/widgets/canvas/line.rs

@@ -48,12 +48,10 @@ impl Shape for Line {
             } else {
                 draw_line_low(painter, x1, y1, x2, y2, self.color);
             }
+        } else if y1 > y2 {
+            draw_line_high(painter, x2, y2, x1, y1, self.color);
         } else {
-            if y1 > y2 {
+            draw_line_high(painter, x1, y1, x2, y2, self.color);
-                draw_line_high(painter, x2, y2, x1, y1, self.color);
-            } else {
-                draw_line_high(painter, x1, y1, x2, y2, self.color);
-            }
         }
     }
 }

src/widgets/list.rs

@@ -41,14 +41,12 @@ impl ListState {
 /// ```
 /// # use tui::widgets::{Block, Borders, List, Text};
 /// # use tui::style::{Style, Color, Modifier};
-/// # fn main() {
 /// let items = ["Item 1", "Item 2", "Item 3"].iter().map(|i| Text::raw(*i));
 /// List::new(items)
 ///     .block(Block::default().title("List").borders(Borders::ALL))
 ///     .style(Style::default().fg(Color::White))
 ///     .highlight_style(Style::default().modifier(Modifier::ITALIC))
 ///     .highlight_symbol(">>");
-/// # }
 /// ```
 pub struct List<'b, L>
 where

src/widgets/table.rs

@@ -131,7 +131,7 @@ where
         Table {
             block: None,
             style: Style::default(),
-            header: header.into_iter(),
+            header,
             header_style: Style::default(),
             widths: &[],
             column_spacing: 1,