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combine_substructure

rustc_builtin_macros::deriving::generic

Function combine_substructure 

Source 
pub(crate) fn combine_substructure<'a>(
    f: impl Fn(&ExtCtxt<'_>, Span, &Substructure<'_>) -> BlockOrExpr + 'a,
) -> Box<dyn Fn(&ExtCtxt<'_>, Span, &Substructure<'_>) -> BlockOrExpr + 'a>