Joshua Chapman 274ace790b Implement iter() for mutable Queries (#2305) ... A sample implementation of how to have `iter()` work on mutable queries without breaking aliasing rules. # Objective - Fixes #753 ## Solution - Added a ReadOnlyFetch to WorldQuery that is the `&T` version of `&mut T` that is used to specify the return type for read only operations like `iter()`. - ~~As the comment suggests specifying the bound doesn't work due to restrictions on defining recursive implementations (like `Or`). However bounds on the functions are fine~~ Never mind I misread how `Or` was constructed, bounds now exist. - Note that the only mutable one has a new `Fetch` for readonly as the `State` has to be the same for any of this to work Co-authored-by: Carter Anderson <mcanders1@gmail.com>		2021-12-01 23:28:10 +00:00
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ui	Implement iter() for mutable Queries (#2305)	2021-12-01 23:28:10 +00:00
ui.rs	Assert compiler errors for compile_fail tests (#3067)	2021-11-13 22:43:19 +00:00