0b01ceb3bb
using the `substVars` tactic on the goal can remove too much information, as it does not take into account that the `motive` may depend on the fixed parameters. This is fixed by etracting `substVar` from `subst` which expects the `x`, not the `h : x = rhs`, and then using this tactic on the local declarations _after_ the `motive` exclusively. |
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