syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// for an unbound type variable. This is convenient for caching etc. See
context_before:     /// A [`FreshTy`][Self::FreshTy] is one that is generated as a replacement
context_after:     /// `rustc_infer::infer::freshen` for more details.