Tactics: add a primitive to spawn a subinvocation of the engine #3226
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This will enable to call the Interpreter from the Basic module.
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... and obtain a proof of typing for the generated witness.
This allows to easily reuse metaprograms that work to solve a goal as metaprograms that create proofs of typing. In particular, we can use this is Pulse to call the typeclass resolution tactic and create well-typed dictionaries for constraints, that do not have to be rechecked by Pulse or F*.
Reusing
tcresolveis othewise not straightforward, as it is very much oriented to working in the proofstate and has no knowledge of typing reflection.