syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"def_id.to_def_id(),"}]}
source_snippet:                 def_id.to_def_id(),
context_before:             infcx.canonicalize_user_type_annotation(ty::UserType::new(ty::UserTypeKind::TypeOf(
context_after:                 ty::UserArgs { args, user_self_ty: None },