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Proof step 20 from proof validrefkeynotnull-has-field (conclusion)

⊦ validrefkeynotnull(str, rk, mkclasstype(class), st) ∧ sk ∈ instfields(class) ∧ is_fskey(sk) → st[rk] .refval -- sk ∈ st

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 19:
is_fskey(sk), sk ∈ instfields(class), validrefkeynotnull(str, rk, mkclasstype(class), st) ⊦ st[rk] .refval -- sk ∈ st

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]