starts describing function that starts with a single item . concode_field_sep Supplier<? extends T> supplier concode_field_sep Function<F,T> supplierAsFunction concode_elem_sep T apply concode_elem_sep Function<F,T> staticFunction concode_elem_sep Function<T,T> identityFunction concode_elem_sep FList<F,List<F>,List<F>> functionFromListOf
FItem < F , F > function ( @ Nullable Class < F > arg0 ) { return new FunctionCompiler ( ) ; }