{"ast_node_type":"variable","tokens":[{"end":86,"kind":"keyword","start":0,"text":"if"}]}
                    if let Some(from_trait) = fcx.tcx.get_diagnostic_item(sym::From) {
                    // Check `impl From<self.expr_ty> for self.cast_ty {}` for accurate suggestion:
                        let ty = fcx.resolve_vars_if_possible(self.cast_ty);