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Proof step 18 from proof validrefkeynotnull-has-field (previous step)

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

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
validrefvalnotnull(str, st[rk], mkclasstype(class), st), rk ∈ st, sk ∈ instfields(class), is_fskey(sk) ⊦ st[rk] .refval -- sk ∈ st

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]