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Proof step 15 from proof junkref-put-badfield (previous step)

junkrefs(str, r0 ' + refs0, val .type, st[r0 -- _type, val]) ⊦ junkref(str, r0, st), is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type), ¬ junkrefs(str, r0 ' + refs0, val .type, st) ∧ (¬ is_typevalue(st[r0 -- _type]) ∨ ¬ is_reftype(st[r0 -- _type] .type))

User applied rule case distinction

And obtained the following new goals

Proof step 14:
junkrefs(str, r0 ' + refs0, val .type, st[r0 -- _type, val]) ⊦ ¬ junkrefs(str, r0 ' + refs0, val .type, st), junkref(str, r0, st), is_typevalue(st[r0 -- _type]) ∧ is_reftype(st[r0 -- _type] .type)

Rule argument

[CASEDARG : pos: right 3, ()]

Additional information

[[CONCRETESIMPRULES : ()]]