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Proof step 21 from proof ac-init (previous step)

void_type ≠ ty ∨ `initstate' .field ≠ fieldvar ⊦ mkfs(class, void_type, `initstate' .field) ' ∈ fis0, ¬ initerror(class, addclass(class, fis0, st)[jvmref -- mkfs(class, ty, fieldvar) ', val]) ∧ ¬ initundone(class, addclass(class, fis0, st)[jvmref -- mkfs(class, ty, fieldvar) ', val])

User applied rule case distinction

And obtained the following new goals

Proof step 15:
void_type ≠ ty ∨ `initstate' .field ≠ fieldvar ⊦ ¬ initerror(class, addclass(class, fis0, st)[jvmref -- mkfs(class, ty, fieldvar) ', val]), mkfs(class, void_type, `initstate' .field) ' ∈ fis0
Proof step 20:
void_type ≠ ty ∨ `initstate' .field ≠ fieldvar ⊦ ¬ initundone(class, addclass(class, fis0, st)[jvmref -- mkfs(class, ty, fieldvar) ', val]), mkfs(class, void_type, `initstate' .field) ' ∈ fis0

Rule argument

[CASEDARG : pos: right 2, ()]

Additional information

[[CONCRETESIMPRULES : ()]]