syntax_data: {"ast_node_type":"import","tokens":[{"end":82,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// requires a 4th entry, rather than merging everything down to 1, because we
context_before:     /// with 7 chunks, we have 3 entries in the stack. Adding an 8th chunk
context_after:     /// don't know whether more input is coming. This is different from how the