syntax_data: {"ast_node_type":"other","tokens":[{"end":17,"kind":"keyword","start":0,"text":"FreshTy(u32),"}]}
source_snippet:     FreshTy(u32),
context_before:     /// Compare with [`TyVar`][Self::TyVar].
context_after:     /// Like [`FreshTy`][Self::FreshTy], but as a replacement for [`IntVar`][Self::IntVar].