syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"proc_macro_quoted_spans:"}]}
source_snippet:     proc_macro_quoted_spans: AppendOnlyVec<Span>,
context_before:     /// identifier represented by its position in the vector.
context_after:     /// Used to generate new `AttrId`s. Every `AttrId` is unique.