syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // raw ids from different crate metadatas.
context_before:     // Reminder: `HygieneDecodeContext` is per-crate, so there are no collisions between
context_after:     if let Some(Some(ctxt)) = context.remapped_ctxts.lock().get(raw_id) {