f1707117f0
Specializes the congr lemma generated for the `arg` conv tactic to only rewrite the chosen argument. This makes it much more likely that the chosen argument is able to be accessed. Lets `arg` access the domain and codomain of pi types via `arg 1` and `arg 2` in more situations. Upstreams `pi_congr` for this from mathlib. Adds a negative indexing option, where `arg -2` accesses the second-to-last argument for example, making the behavior of `lhs` available to `arg`. This works for `enter` as well. Other improvement: when there is an error in the `enter [...]` tactic, individual locations get underlined with the error. The tactic info now also is like `rw`, so you can see the intermediate conv states. Closes #5871 |
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