syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// The other fields are only for caching.
context_before: /// If this part of two syntax contexts is equal, then the whole syntax contexts should be equal.
context_after: pub type SyntaxContextKey = (SyntaxContext, ExpnId, Transparency);