[Merged by Bors] - feat: (↑) notation for coercions
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See leanprover-community/mathport#116 (comment) The notation is a bit problematic for the pretty-printer, as it doesn't automatically insert parentheses to disambiguate it from the built-in coercion notation. Alternatives: 1. Use a different token. 2. Magically define `(↑ ∙)` to be the eta-reduction of `fun x => ↑x`. PS: the old macro for `↑ x` was redundant since it's been moved to core some time ago.
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(↑) notation for coercions(↑) notation for coercions
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See leanprover-community/mathport#116 (comment)
The notation is a bit problematic for the pretty-printer, as it doesn't automatically insert parentheses to disambiguate it from the built-in coercion notation. Alternatives:
(↑ ∙)to be the eta-reduction offun x => ↑x.PS: the old macro for
↑ xwas redundant since it's been moved to core some time ago.