Intrinsic verification syntax

A definition carrying requires P / ensures b => Q clauses expands to the plain definition plus a vcgen-proven, @[spec]-tagged specification theorem f.spec. An assert element in a do block elaborates to the assertion gadget that vcgen proves in the course of that theorem.

def Lean.Elab.Tactic.Do.contractBinderIdents (binder : Syntax) : Array Ident

The identifiers bound by an explicit (…) binder, used to apply the definition in its spec.

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def Lean.Elab.Tactic.Do.expandDefContract : Macro

Expand a def carrying requires/ensures clauses into the plain def plus a spec theorem @[spec] theorem f.spec : ⦃P⦄ f args ⦃fun b => Q⦄ proved by vcgen. A where finally | spec => steps section supplies grind-mode steps for the verification conditions finish leaves open.

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def Lean.Elab.Tactic.Do.elabDoAssertion : Do.DoElab

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