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Proof step 4 from proof validref-object (previous step)

⊦ r = jvmref, r = jvmref ∨ st[r -- _type] .type ≤ mkclasstype(`java.lang.Object' .class) ∧ ¬ junkref(str, r, st), junkref(str, r, st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ r = jvmref, junkref(str, r, st), is_classtype(st[r -- _type] .type), is_arraytype(st[r -- _type] .type)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPNAMEDSEQ : typefuns, , subtype-object-01, ⊦ ty ≤ mkclasstype (`java.lang.Object' .class) ↔ is_classtype(ty) ∨ is_arraytype(ty)])]]