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Proof step 2 from proof is_valid_ref-int (previous step)

st[r -- _type] .type = int_type, is_valid_ref(str, r, st) ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 1:
⊦ ¬ is_reftype(st[r -- _type] .type) → ¬ is_valid_ref(str, r, st)

Rule argument

[crewrite-arg: is_valid_ref-reftype, F, [st, r, str] → [st, r, str]]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_reftype(int_type)])], [EXTRATERMS : (st, r, str)]]