syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"span:"}]}
source_snippet:                                 span: ty.span,
context_before:                                 user_ty: Box::new(user_ty),
context_after:                                 inferred_ty: self.typeck_results.node_type(ty.hir_id),