#with_goal tactic#1430
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The tactic term with_goal (only available in eval) calls its parameter tactic with the current goal seen as a Prop. It uses builtins to transform lambdapi Pi and -> into 1st order forall and =>.
I have also modified assume - the created variable was not passed to the tactic and the type of #refine in Tactic.lp
While writing an example for with_goal it appears that #assume must be duplicated for Props and Sets because, when used for Props, the type is more complex - a dependent type is needed.