fn build_closure(
parts: PeekableProcIter,
elements: Vec<ElemToClone>,
return_kind: Option<WrapperKind>,
kind: BlockKind,
) -> TokenStream
fn build_closure(
parts: PeekableProcIter,
elements: Vec<ElemToClone>,
return_kind: Option<WrapperKind>,
kind: BlockKind,
) -> TokenStream