f89ed40618
This introduces the `ArgsPacker` module and abstraction, to replace the exising `PackDomain`/`PackMutual` code. The motivation was that we now have more uses besides `Fix.lean` (`GuessLex` and `FunInd`), and the code was spread in various places. The goals are * consistent function naming withing the the `PSigma` handling, the `PSum` handling, and the combined interface * avoid taking a type apart just based on the `PSigma`/`PSum` nesting, to be robust in case the user happens to be using `PSigma`/`PSum` somewhere. Therefore, always pass an `arity` or `numFuncs` or `varNames` around. * keep all the `PSigma`/`PSum` encoding logic contained within one module (`ArgsPacker`), and keep that module independent of its users (so no `EqnInfos` visible here). * pick good variable names when matching on a packed argument * the unary function now is either called `fun1._unary` or `fun1._mutual`, never `fun1._unary._mutual`. This file has less heavy dependencies than `PackMutual` had, so build parallelism is improved as well.
18 lines
316 B
Text
18 lines
316 B
Text
mutual
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def f : Nat → Bool → Nat
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| n, true => 2 * f n false
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| 0, false => 1
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| n, false => n + g n
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termination_by n b => (n, if b then 2 else 1)
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def g (n : Nat) : Nat :=
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if h : n ≠ 0 then
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f (n-1) true
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else
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n
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termination_by (n, 0)
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end
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#print f
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#print g
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#print f._mutual
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