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Proof step 2 from proof base-return (previous step)

⊦ flatten(return(val, boolean_type)) = return(val, boolean_type)

Heuristic cut applied rule cut formula

And obtained the following new goals

Proof step 1:
⊦ ¬ is_valuelist(val) → flatten(val) = val

Rule argument

[fma-arg: is_valuelist(return(val, boolean_type))]

Additional information

[[CONCRETESIMPRULES : ([CSIMPSEQ : ⊦ ¬ is_valuelist(return(val, ty))])], [EXTRAFMAS : (is_valuelist(return(val, boolean_type)))]]