syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // until we figure a way to add the pretty printers without requiring a volatile load cf.
context_before:         // like std::Vec, which is not that used in no-std context, so it's best to left it out
context_after:         // rust-lang/rust#44993.