Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
eea953b94f
Adds `pushGoal`/`pushGoals` and `popGoal` for manipulating the goal state. These are an alternative to `replaceMainGoal` and `getMainGoal`, and with them you don't need to worry about making sure nothing clears assigned metavariables from the goal list between assigning the main goal and using `replaceMainGoal`. Modifies `closeMainGoalUsing`, which is like a `TacticM` version of `liftMetaTactic`. Now the callback is run in a context where the main goal is removed from the goal list, and the callback is free to modify the goal list. Furthermore, the `checkUnassigned` argument has been replaced with `checkNewUnassigned`, which checks whether the value assigned to the goal has any *new* metavariables, relative to the start of execution of the callback. This API is sufficient for the `exact` tactic for example. Modifies `withCollectingNewGoalsFrom` to take the `parentTag` argument explicitly rather than indirectly via `getMainTag`. This is needed when used under `closeMainGoalUsing`. Modifies `elabTermWithHoles` to optionally take `parentTag?`. It defaults to `getMainTag` if it is `none`. Renames `Tactic.tryCatch` to `Tactic.tryCatchRestore`, and adds a `Tactic.tryCatch` that doesn't do backtracking. --------- Co-authored-by: Kim Morrison <kim@tqft.net> |
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