feat: keywords guarded, fix, cofix, and iinductive - #651
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I've only had a brief look at this. Can you please make this a stacked PR such that it is easier to review?
| elabFixpointDef ``bi_least_fixpoint ``least_fixpoint_unfold mods name binders ty body monoPf nePf | ||
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| /-- Recursive definition via the greatest fixpoint. -/ | ||
| elab mods:declModifiers "cofix " name:ident binders:fixpointBinder* |
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Can you create a cofix? command that shows the code that it generates? This would be very useful for debugging and understanding what the command does. The same applies to the other commands that generate Lean code.
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Description
This adds keywords that allow for straightforward recursive definitions of predicates, automatically producing a pre-definition, proving relevant properties, and constructing a fixpoint. Furthermore,
iinductiveutilises these for definitions of inductive predicates using a syntax familiar from Lean's usualinductive.Fixes #427 and #428
Depends on #558 and #595
Checklist
authorssection of any appropriate files