Doctest improvments (#1937)

crates/bevy_core/src/time/stopwatch.rs

@@ -11,11 +11,14 @@ use bevy_utils::Duration;
 /// use std::time::Duration;
 /// let mut stopwatch = Stopwatch::new();
 /// assert_eq!(stopwatch.elapsed_secs(), 0.0);
+///
 /// stopwatch.tick(Duration::from_secs_f32(1.0)); // tick one second
 /// assert_eq!(stopwatch.elapsed_secs(), 1.0);
+///
 /// stopwatch.pause();
 /// stopwatch.tick(Duration::from_secs_f32(1.0)); // paused stopwatches don't tick
 /// assert_eq!(stopwatch.elapsed_secs(), 1.0);
+///
 /// stopwatch.reset(); // reset the stopwatch
 /// assert!(stopwatch.paused());
 /// assert_eq!(stopwatch.elapsed_secs(), 0.0);

crates/bevy_ecs/src/bundle.rs

@@ -34,7 +34,7 @@ use std::{any::TypeId, collections::HashMap};
 ///     #[bundle]
 ///     a: A,
 ///     z: String,
-///   }
+/// }
 /// ```
 ///
 /// # Safety

crates/bevy_ecs/src/query/filter.rs

@@ -610,18 +610,21 @@ impl_tick_filter!(
     ///
     /// Example:
     /// ```
+    /// # use bevy_ecs::system::IntoSystem;
     /// # use bevy_ecs::system::Query;
     /// # use bevy_ecs::query::Added;
     /// #
     /// # #[derive(Debug)]
     /// # struct Name {};
     /// # struct Transform {};
-    /// #
+    ///
     /// fn print_add_name_component(query: Query<&Name, Added<Name>>) {
     ///     for name in query.iter() {
     ///         println!("Named entity created: {:?}", name)
     ///     }
     /// }
+    ///
+    /// # print_add_name_component.system();
     /// ```
     Added,
     AddedState,
@@ -642,18 +645,21 @@ impl_tick_filter!(
     ///
     /// Example:
     /// ```
+    /// # use bevy_ecs::system::IntoSystem;
     /// # use bevy_ecs::system::Query;
     /// # use bevy_ecs::query::Changed;
     /// #
     /// # #[derive(Debug)]
     /// # struct Name {};
     /// # struct Transform {};
-    /// #
+    ///
     /// fn print_moving_objects_system(query: Query<&Name, Changed<Transform>>) {
     ///     for name in query.iter() {
     ///         println!("Entity Moved: {:?}", name);
     ///     }
     /// }
+    ///
+    /// # print_moving_objects_system.system();
     /// ```
     Changed,
     ChangedState,

crates/bevy_ecs/src/system/system_param.rs

@@ -32,6 +32,8 @@ use std::{
 /// fn my_system(param: MyParam) {
 ///     // Access the resource through `param.foo`
 /// }
+///
+/// # my_system.system();
 /// ```
 pub trait SystemParam: Sized {
     type Fetch: for<'a> SystemParamFetch<'a>;
@@ -573,10 +575,17 @@ impl<'a, T: Component + FromWorld> SystemParamFetch<'a> for LocalState<T> {
 ///
 /// Basic usage:
 ///
-/// ```ignore
+/// ```
+/// # use bevy_ecs::system::IntoSystem;
+/// # use bevy_ecs::system::RemovedComponents;
+/// #
+/// # struct MyComponent;
+///
 /// fn react_on_removal(removed: RemovedComponents<MyComponent>) {
-///     removed.iter().for_each(|removed_entity| println!("{}", removed_entity));
+///     removed.iter().for_each(|removed_entity| println!("{:?}", removed_entity));
 /// }
+///
+/// # react_on_removal.system();
 /// ```
 pub struct RemovedComponents<'a, T> {
     world: &'a World,

examples/3d/spawner.rs

@@ -7,7 +7,7 @@ use rand::{rngs::StdRng, Rng, SeedableRng};
 /// This example spawns a large number of cubes, each with its own changing position and material
 /// This is intended to be a stress test of bevy's ability to render many objects with different
 /// properties For the best results, run it in release mode:
-/// ```
+/// ```bash
 /// cargo run --example spawner --release
 /// ```
 /// NOTE: Bevy still has a number of optimizations to do in this area. Expect the