syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // late-bound region and the other for the binder level) to determine
context_before:             // regions. We use two `DebruijnIndex`es (one for the currently folded
context_after:             // whether a name has already been created for the currently folded region,