09a5b34931
This PR adjusts the experimental module system to make `private` the default visibility modifier in `module`s, introducing `public` as a new modifier instead. `public section` can be used to revert the default for an entire section, though this is more intended to ease gradual adoption of the new semantics such as in `Init` (and soon `Std`) where they should be replaced by a future decl-by-decl re-review of visibilities.
16 lines
379 B
Text
16 lines
379 B
Text
/-
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Copyright (c) 2024 Lean FRO. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Kim Morrison
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-/
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module
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prelude
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public import Init.Core
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public section
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deriving instance DecidableEq for ULift
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instance [Subsingleton α] : Subsingleton (ULift α) where
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allEq := fun ⟨a⟩ ⟨b⟩ => congrArg ULift.up (Subsingleton.elim a b)
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