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add some info to known_bugs

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Floris van Doorn 2017-07-17 14:15:11 +01:00
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Notes/known_bugs.txt
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@ -1,3 +1,5 @@
A list of bugs and/or unintuitive behavior in Lean 2:
- When using the "have" or "assert" tactic, no coercion is applied to the type. So you have to write for example - When using the "have" or "assert" tactic, no coercion is applied to the type. So you have to write for example
`have g : Group.carrier G, from _,` `have g : Group.carrier G, from _,`
instead of instead of
@ -27,5 +29,6 @@ equiv.MK f
abstract (* long proof *) end abstract (* long proof *) end
abstract (* long proof *) end abstract (* long proof *) end
``` ```
this has the additional advantage that if f and/or g are defined using induction, they will only reduce if they are applied to arguments for which they actually reduce (assuming they have the correct [unfold n] flag.
- unfold [foo] also does various (sometimes unwanted) reductions (as if you called esimp) - unfold [foo] also does various (sometimes unwanted) reductions (as if you called esimp)