syntax_data: {"ast_node_type":"variable","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(impl_def_id) = self.tcx.impl_of_assoc(def_id)
context_before:             let def_id = self.body.source.instance.def_id();
context_after:                 && self.tcx.is_builtin_derived(impl_def_id)