Reformat & fix clippy

cursive-core/src/utils/span.rs

@@ -523,7 +523,7 @@ impl IndexedCow {
 
     /// Returns the embedded text content if `self` is `IndexedCow::Owned`.
     pub fn as_owned(&self) -> Option<&str> {
-        if let &IndexedCow::Owned(ref content) = self {
+        if let IndexedCow::Owned(ref content) = *self {
             Some(content)
         } else {
             None

examples/src/bin/theme.rs

@@ -7,7 +7,8 @@ fn main() {
     siv.load_theme_file("assets/style.toml").unwrap();
 
     // Or you can directly load it from a string for easy deployment.
-    siv.load_toml(include_str!("../../assets/style.toml")).unwrap();
+    siv.load_toml(include_str!("../../assets/style.toml"))
+        .unwrap();
 
     siv.add_layer(
         Dialog::around(TextView::new(

rustfmt.toml

@@ -1,4 +1,3 @@
-unstable_features = true
 max_width = 79
 reorder_imports = true
 fn_args_layout = "Tall"