Nicholas Nethercote
a97cd3ba57
The `state: A::Domain` value is the primary things that's modified when performing an analysis. The `Analysis` impl is immutable in every case but one (`MaybeRequiredStorage`) and it now uses interior mutability. As well as changing many `&mut A` arguments to `&A`, this also: - lets `CowMut` be replaced with the simpler `SimpleCow` in `cursor.rs`; - removes the need for the `RefCell` in `Formatter`; - removes the need for `MaybeBorrowedLocals` to impl `Clone`, because it's a unit type and it's now clear that its constructor can be used directly instead of being put into a local variable and cloned.
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