af5322c7ef
This PR modifies `intro` to create tactic info localized to each hypothesis, making it possible to see how `intro` works variable-by-variable. Additionally: - The tactic supports `intro rfl` to introduce an equality and immediately substitute it, like `rintro rfl` (recall: the `rfl` pattern is like doing `intro h; subst h`). The `rintro` tactic can also now support `HEq` in `rfl` patterns if `eq_of_heq` applies. - In `intro (h : t)`, elaboration of `t` is interleaved with unification with the type of `h`, which prevents default instances from causing unification to fail. - Tactics that change types of hypotheses (including `intro (h : t)`, `delta`, `dsimp`) now update the local instance cache. In `intro x y z`, tactic info ranges are `intro x`, `y`, and `z`. The reason for including `intro` with `x` is to make sure the info range is "monotonic" while adding the first argument to `intro`.
187 lines
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187 lines
10 KiB
Text
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