syntax_data: {"ast_node_type":"import","tokens":[{"end":77,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // called `sym::proc_macro` because then it's easy to mistakenly think it
context_before:     // E.g. `sym::proc_dash_macro` represents "proc-macro", and it shouldn't be
context_after:     // represents "proc_macro".