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Proof step 5 from proof isobj-field-in (previous step)

st[r -- _type] = typeval(mkclasstype(class0)), class0 ≤ class, sk ∈ instfields(class), r -- _type ∈ st, ∀ sk. sk ∈ instfields(class0) → goodfieldandtype(r, sk, st), r ∈ st ⊦ r = jvmref, r -- sk ∈ st

User applied rule all left

And obtained the following new goals

Proof step 4:
⊦ sk ∈ instfields(class) ∧ class0 ≤ class → sk ∈ instfields(class0)

Rule argument

[EXRARG : pos: left 5, [extquanttermlist: (sk)abort:F, discard:T, computed:F]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ r -- sk ∈ st → ¬ goodfieldandtype(r, sk, st)])], [EXTRATERMS : (sk)]]