Enable more clippy lints

Cranky.toml

@@ -22,6 +22,7 @@ warn = [
     "clippy::expl_impl_clone_on_copy",
     "clippy::explicit_deref_methods",
     "clippy::explicit_into_iter_loop",
+    "clippy::explicit_iter_loop",
     "clippy::fallible_impl_from",
     "clippy::filter_map_next",
     "clippy::flat_map_option",
@@ -43,6 +44,7 @@ warn = [
     "clippy::linkedlist",
     "clippy::lossy_float_literal",
     "clippy::macro_use_imports",
+    "clippy::manual_assert",
     "clippy::manual_ok_or",
     "clippy::map_err_ignore",
     "clippy::map_flatten",
@@ -88,14 +90,17 @@ warn = [
     "clippy::useless_transmute",
     "clippy::verbose_file_reads",
     "clippy::zero_sized_map_values",
+    "elided_lifetimes_in_paths",
     "future_incompatible",
     "nonstandard_style",
     "rust_2018_idioms",
+    "rust_2021_prelude_collisions",
     "rustdoc::missing_crate_level_docs",
     "semicolon_in_expressions_from_macros",
     "trivial_numeric_casts",
     "unused_extern_crates",
     "unused_import_braces",
+    "unused_lifetimes",
     # "clippy::cloned_instead_of_copied",
     # "clippy::mod_module_files",
     # "trivial_casts",

egui/src/input_state/touch_state.rs

@@ -286,7 +286,7 @@ impl TouchState {
 impl Debug for TouchState {
     // This outputs less clutter than `#[derive(Debug)]`:
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        for (id, touch) in self.active_touches.iter() {
+        for (id, touch) in &self.active_touches {
             f.write_fmt(format_args!("#{:?}: {:#?}\n", id, touch))?;
         }
         f.write_fmt(format_args!("gesture: {:#?}\n", self.gesture_state))?;

egui_demo_lib/src/demo/plot_demo.rs

@@ -90,15 +90,13 @@ impl LineDemo {
                 ComboBox::from_label("Line style")
                     .selected_text(line_style.to_string())
                     .show_ui(ui, |ui| {
-                        for style in [
+                        for style in &[
                             LineStyle::Solid,
                             LineStyle::dashed_dense(),
                             LineStyle::dashed_loose(),
                             LineStyle::dotted_dense(),
                             LineStyle::dotted_loose(),
-                        ]
-                        .iter()
-                        {
+                        ] {
                             ui.selectable_value(line_style, *style, style.to_string());
                         }
                     });

egui_demo_lib/src/syntax_highlighting.rs

@@ -29,10 +29,10 @@ pub fn highlight(ctx: &egui::Context, theme: &CodeTheme, code: &str, language: &
         }
     }
 
-    type HighlightCache<'a> = egui::util::cache::FrameCache<LayoutJob, Highlighter>;
+    type HighlightCache = egui::util::cache::FrameCache<LayoutJob, Highlighter>;
 
     let mut memory = ctx.memory();
-    let highlight_cache = memory.caches.cache::<HighlightCache<'_>>();
+    let highlight_cache = memory.caches.cache::<HighlightCache>();
     highlight_cache.get((theme, code, language))
 }
 

emath/src/smart_aim.rs

@@ -85,7 +85,7 @@ fn to_decimal_string(v: f64) -> [i32; NUM_DECIMALS] {
     crate::emath_assert!(v < 10.0, "{:?}", v);
     let mut digits = [0; NUM_DECIMALS];
     let mut v = v.abs();
-    for r in digits.iter_mut() {
+    for r in &mut digits {
         let digit = v.floor();
         *r = digit as i32;
         v -= digit;

epaint/src/mutex.rs

@@ -170,25 +170,25 @@ mod rw_lock_impl {
         }
 
         pub fn read(&self) -> RwLockReadGuard<'_, T> {
-            if self.lock.is_locked_exclusive() {
-                panic!(
+            assert!(
+                !self.lock.is_locked_exclusive(),
                 "{} DEAD-LOCK DETECTED! Previous lock held at:\n{}\n\n",
                 std::any::type_name::<Self>(),
                 format_backtrace(&mut self.last_lock.lock())
             );
-            }
+
             *self.last_lock.lock() = make_backtrace();
             parking_lot::RwLockReadGuard::map(self.lock.read(), |v| v)
         }
 
         pub fn write(&self) -> RwLockWriteGuard<'_, T> {
-            if self.lock.is_locked() {
-                panic!(
+            assert!(
+                !self.lock.is_locked(),
                 "{} DEAD-LOCK DETECTED! Previous lock held at:\n{}\n\n",
                 std::any::type_name::<Self>(),
                 format_backtrace(&mut self.last_lock.lock())
             );
-            }
+
             *self.last_lock.lock() = make_backtrace();
             parking_lot::RwLockWriteGuard::map(self.lock.write(), |v| v)
         }