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eb1a5c9bb3
Rename Unsafe to Safety Alternative to #124455, which is to just have one Safety enum to use everywhere, this opens the posibility of adding `ast::Safety::Safe` that's useful for unsafe extern blocks. This leaves us today with: ```rust enum ast::Safety { Unsafe(Span), Default, // Safe (going to be added for unsafe extern blocks) } enum hir::Safety { Unsafe, Safe, } ``` We would convert from `ast::Safety::Default` into the right Safety level according the context.