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Proof step 41 from proof reffield-del (previous step)

has_reffield(r0, st), is_obj(r0, st) ∨ is_array(r0, st) ⊦ r0 = r, has_reffield(r0, st -- r)

User applied rule case distinction

And obtained the following new goals

Proof step 35:
is_obj(r0, st), has_reffield(r0, st) ⊦ r0 = r, has_reffield(r0, st -- r)
Proof step 40:
is_array(r0, st), has_reffield(r0, st) ⊦ r0 = r, has_reffield(r0, st -- r)

Rule argument

[CASEDARG : pos: left 2, ()]

Additional information

[[CONCRETESIMPRULES : ()]]