def get_proof_term(self, goal, *, args=None, prevs=None):
if args is None:
var_names = []
else:
var_names = args
vars, As, C = logic.strip_all_implies(goal.prop, var_names, svar=False)
pt = ProofTerm.sorry(Thm(list(goal.hyps) + As, C))
ptAs = [ProofTerm.assume(A) for A in As]
ptVars = [ProofTerm.variable(var.name, var.T) for var in vars]
return ProofTerm('intros', None, ptVars + ptAs + [pt])
def testIntro(self):
basic.load_theory('logic_base')
macro = logic.intros_macro()
Ta = TVar('a')
x = Var('x', Ta)
P = Var('P', TFun(Ta, BoolType))
C = Var('C', BoolType)
ex_P = Exists(x, P(x))
pt1 = ProofTerm.assume(ex_P)
pt2 = ProofTerm.variable('x', Ta)
pt3 = ProofTerm.assume(P(x))
pt4 = ProofTerm.sorry(Thm([P(x)], C))
pt4 = ProofTerm('intros', args=[ex_P], prevs=[pt1, pt2, pt3, pt4])
prf = pt4.export()
self.assertEqual(theory.check_proof(prf), Thm([ex_P], C))
