syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"infcx.instantiate_ty_var_raw("}]}
source_snippet:                 infcx.instantiate_ty_var_raw(
context_before:             (_, ty::Infer(ty::TyVar(b_vid))) => {
context_after:                     self,