syntax_data: {"ast_node_type":"other","tokens":[{"end":83,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // them when interning. Perf testing found this to be a modest improvement.
context_before:         // Nothing to fold, so let's avoid visiting things and possibly re-hashing/equating
context_after:         // See: <https://github.com/rust-lang/rust/pull/142317>