syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// know what set of types a given type variable can be unified with.
context_before: /// usize or f32). In order to faithfully reproduce a type, we need to
context_after: #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]