Daniel McNab c893b99224 Optional .system (#2398) ... This can be your 6 months post-christmas present. # Objective - Make `.system` optional - yeet - It's ugly - Alternative title: `.system` is dead; long live `.system` - **yeet** ## Solution - Use a higher ranked lifetime, and some trait magic. N.B. This PR does not actually remove any `.system`s, except in a couple of examples. Once this is merged we can do that piecemeal across crates, and decide on syntax for labels.		2021-06-27 00:40:09 +00:00
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commands.rs	small ecs cleanup and remove_bundle drop bugfix (#2172)	2021-05-18 19:25:57 +00:00
exclusive_system.rs	Optional .system (#2398)	2021-06-27 00:40:09 +00:00
function_system.rs	Optional .system (#2398)	2021-06-27 00:40:09 +00:00
mod.rs	fix clippy warning failing on CI (#2353)	2021-06-18 00:08:39 +00:00
query.rs	[ecs] implement is_empty for queries (#2271)	2021-06-02 20:50:06 +00:00
system.rs	Cargo fmt with unstable features (#1903)	2021-04-21 23:19:34 +00:00
system_chaining.rs	Improve bevy_ecs::system module docs (#1932)	2021-04-15 20:36:16 +00:00
system_param.rs	Allow Option<NonSend<T>> and Option<NonSendMut<T>> as SystemParam (#2345)	2021-06-26 19:29:38 +00:00