style: simplify string formatting for readability (#1381)

build.rs

@@ -13,10 +13,7 @@ fn main() {
 
     fn env_var(var: &str) -> String {
       std::env::var(var).unwrap_or_else(|_| {
-        panic!(
-          "`{}` is not set, which is needed to generate the kotlin files for android.",
-          var
-        )
+        panic!("`{var}` is not set, which is needed to generate the kotlin files for android.")
       })
     }
 
@@ -61,8 +58,8 @@ fn main() {
             .to_uppercase()
         );
 
-        println!("cargo:rerun-if-env-changed={}", class_extension_env);
-        println!("cargo:rerun-if-env-changed={}", class_init_env);
+        println!("cargo:rerun-if-env-changed={class_extension_env}");
+        println!("cargo:rerun-if-env-changed={class_init_env}");
 
         let content = fs::read_to_string(file.path())
           .expect("failed to read kotlin file as string")

src/webkitgtk/mod.rs

@@ -825,7 +825,7 @@ pub fn platform_webview_version() -> Result<String> {
       webkit_get_micro_version(),
     )
   };
-  Ok(format!("{}.{}.{}", major, minor, patch))
+  Ok(format!("{major}.{minor}.{patch}"))
 }
 
 // SAFETY: only use this when you are sure the span will be dropped on the same thread it was entered

src/webkitgtk/web_context.rs

@@ -11,7 +11,7 @@ use soup::{MessageHeaders, MessageHeadersType};
 use std::{
   borrow::Cow,
   cell::RefCell,
-  collections::{HashSet, VecDeque},
+  collections::VecDeque,
   path::PathBuf,
   rc::Rc,
   sync::{