syntax_data: {"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // then check if we are passing through one now and record it if so.
context_before:                     // If we haven't already passed through a backwards-incompatible node,
context_after:                     // This is for now only working for cases where a temporary lifetime is