syntax_data: {"ast_node_type":"variable","tokens":[{"end":59,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if let Some(impl_def_id) = impl_def_id.as_local() {
context_before:         // bad unconstrained infer vars.
context_after:             tcx.ensure_ok().enforce_impl_non_lifetime_params_are_constrained(impl_def_id)?;