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Proof step 15 from proof validrefkeynotnull-union (previous step)

r -- _type ∈ st, st[rk] = refval(r), st[r -- _type] .type ≤ ty, rk ∈ st ⊦ r = jvmref, junkref(str, r, st), st[r -- _type] .type ≤ ty ∧ ¬ junkref(str, r, st0 ∪ st)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 14:
st[rk] = refval(r), r -- _type ∈ st, st[r -- _type] .type ≤ ty, rk ∈ st, junkref(str, r, st0 ∪ st), r ∈ st ⊦ r = jvmref, junkref(str, r, st)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ([CSIMPFORWARD : ⊦ r -- sk ∈ st → r ∈ st])]]