syntax_data: {"ast_node_type":"import","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // `SyntaxContext::outer` do the same thing, but the former is for use within a
context_before: // `SyntaxContext` or `ExpnId`. For example, `HygieneData::outer` and
context_after: // `HygieneData::with` call while the latter is for use outside such a call.