71cf266cd7
This PR adds a procedure that efficiently transforms `let` expressions into `have` expressions (`Meta.letToHave`). This is exposed as the `let_to_have` tactic. It uses the `withTrackingZetaDelta` technique: the expression is typechecked, and any `let` variables that don't enter the zeta delta set are nondependent. The procedure uses a number of heuristics to limit the amount of typechecking performed. For example, it is ok to skip subexpressions that do not contain fvars, mvars, or `let`s. |
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