syntax_data: {"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":".fold(layout::Tree::<Def,"}]}
source_snippet:                 .fold(layout::Tree::<Def, !, !>::uninhabited(), layout::Tree::<Def, !, !>::or)
context_before:             alts.into_iter()
context_after:         };