fix some clippy warnings

examples/progress.rs

@@ -78,7 +78,7 @@ fn phase_2(s: &mut Cursive) {
     let speeds: Vec<_> =
         (0..n_bars).map(|_| rand::thread_rng().gen_range(50, 150)).collect();
 
-    let n_max = 100000;
+    let n_max = 100_000;
     let cb = s.cb_sink().clone();
 
     // Let's prepare the progress bars...

src/backend/curses/mod.rs

@@ -31,11 +31,11 @@ fn find_closest(color: &Color) -> i16 {
         Color::Light(BaseColor::Cyan) => 14,
         Color::Light(BaseColor::White) => 15,
         Color::Rgb(r, g, b) => {
-            let r = 6 * r as u16 / 256;
+            let r = 6 * u16::from(r) / 256;
-            let g = 6 * g as u16 / 256;
+            let g = 6 * u16::from(g) / 256;
-            let b = 6 * b as u16 / 256;
+            let b = 6 * u16::from(b) / 256;
             (16 + 36 * r + 6 * g + b) as i16
         }
-        Color::RgbLowRes(r, g, b) => (16 + 36 * r + 6 * g + b) as i16,
+        Color::RgbLowRes(r, g, b) => i16::from(16 + 36 * r + 6 * g + b),
     }
 }

src/backend/curses/n.rs

@@ -20,7 +20,7 @@ impl Concrete {
                     -> i16 {
 
         let n = 1 + pairs.len() as i16;
-        let target = if ncurses::COLOR_PAIRS() > n as i32 {
+        let target = if ncurses::COLOR_PAIRS() > i32::from(n) {
             // We still have plenty of space for everyone.
             n
         } else {

src/utf8.rs

@@ -25,7 +25,7 @@ pub fn read_char<F>(first: u8, next: F) -> Result<char, String>
     let mut res = 0u32;
 
     // First, get the data - only the few last bits
-    res |= (first & make_mask(7 - n_bytes)) as u32;
+    res |= u32::from(first & make_mask(7 - n_bytes));
 
     // We already have one byte, now read the others.
     for _ in 1..n_bytes {
@@ -39,7 +39,7 @@ pub fn read_char<F>(first: u8, next: F) -> Result<char, String>
         // We have 6 fresh new bits to read, make room.
         res <<= 6;
         // 0x3F is 00111111, so we keep the last 6 bits
-        res |= (byte & 0x3F) as u32;
+        res |= u32::from(byte & 0x3F);
     }
 
     // from_u32 could return an error if we gave it invalid utf-8.

src/views/edit_view.rs

@@ -13,6 +13,13 @@ use utils::simple_suffix;
 use vec::Vec2;
 use view::View;
 
+/// closure type for callbacks when the content is modified. Arguments are the
+/// `Cursive`, current content of the input and cursor position
+pub type OnEdit = Fn(&mut Cursive, &str, usize);
+
+/// closure type for callbacks when Enter is pressed. Arguments are the `Cursive`
+/// and the content of the input.
+pub type OnSubmit = Fn(&mut Cursive, &str);
 
 /// Input box where the user can enter and edit text.
 ///
@@ -75,10 +82,10 @@ pub struct EditView {
     /// Callback when the content is modified.
     ///
     /// Will be called with the current content and the cursor position.
-    on_edit: Option<Rc<Fn(&mut Cursive, &str, usize)>>,
+    on_edit: Option<Rc<OnEdit>>,
 
     /// Callback when <Enter> is pressed.
-    on_submit: Option<Rc<Fn(&mut Cursive, &str)>>,
+    on_submit: Option<Rc<OnSubmit>>,
 
     /// When `true`, only print `*` instead of the true content.
     secret: bool,