d34386fef7
We can now elaborate https://gist.github.com/gebner/439273deee592603190d4f8b4447295b in 1.6 secs and using less than 500Kb of stack space. It was takins 44 secs and 5Mb before this commit. Two modifications: 1) Use pre_monad.seq instead of pre_monad.and_then. They have the same implementation, but seq is not marked as [inline]. 2) Modify how we concatenate the tactics in a begin...end block. Before: (((a_1 ++ a_2) ++ a_3) ++ a_4) After: ((a_1 ++ a_2) ++ (a_3 ++ a_4))
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bad_error5.lean:9:0: error: _tactic._val_3: trying to evaluate sorry
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