Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
2bbf5db04f
This PR ensures that the infotree recognizes `Classical.propDecidable` as an instance, when below a `classical` tactic. The `classical` tactic modifies the environment that the subsequent sequence of tactics runs in (by making `Classical.propDecidable` an instance). However, it does not add a corresponding `InfoTree.context` node, so its effects are not visible when we want to replay a tactic sequence (for example when running a tactic in the tactic analysis framework). We should add a call to `Lean.Elab.withSafeInfoContext` to remedy this issue. There are two potential places to add this class: in the meta-level `Lean.Elab.Tactic.classical` wrapper, or the tactic-level `evalClassical` tactic elaborator. I chose the latter since meta-level does not have access to info tree operations (unless we add many parameters to `Lean.Elab.Tactic.classical`: `[MonadNameGenerator m] [MonadOptions m] [MonadMCtx m] [MonadResolveName m] [MonadFileMap m]`). A testcase that uses the tactic analysis framework is available here: https://github.com/leanprover-community/mathlib4/pull/29501 |
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