syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"rustc_errors::DiagArgValue::Str(std::borrow::Cow::Owned(pred))"}]}
source_snippet:             rustc_errors::DiagArgValue::Str(std::borrow::Cow::Owned(pred))
context_before:             let pred = tcx.short_string(self, path);
context_after:         })