syntax_data: {"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // `SyntaxContext`s in the current global `HygieneData`.
context_before:     // A cache mapping raw serialized per-crate syntax context ids to corresponding decoded
context_after:     remapped_ctxts: Lock<IndexVec<u32, Option<SyntaxContext>>>,