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Allow
SystemParam
s with private fields (#7056)
# Objective - Fix #4200 Currently, `#[derive(SystemParam)]` publicly exposes each field type, which makes it impossible to encapsulate private fields. ## Solution Previously, the fields were leaked because they were used as an input generic type to the macro-generated `SystemParam::State` struct. That type has been changed to store its state in a field with a specific type, instead of a generic type. --- ## Changelog - Fixed a bug that caused `#[derive(SystemParam)]` to leak the types of private fields.
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