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Proof step 7 from proof return (previous step)

⊦ is_valuelist(val), flatten(val ++ return(val0, ty)) = flatten(val) ++ return(val0, ty)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
⊦ ¬ is_valuelist(val) → flatten(val) = val
Proof step 6:
⊦ flatten(val ++ return(val0, ty)) = val ++ return(val0, ty), is_valuelist(val)

Rule argument

[emptyarg]

Additional information

[[CONCRETESIMPRULES : ()]]