syntax_data: {"ast_node_type":"import","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // with macro_rules, it is necessary to use recursive mechanic ("Incremental TT Munchers").
context_before: // To generate CodegenOptionsTargetModifiers and UnstableOptionsTargetModifiers enums
context_after: #![recursion_limit = "256"]