syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                     if self.tcx().codegen_fn_attrs(def_id).safe_target_features {
context_before:                     let mut sig = self.tcx().fn_sig(def_id).instantiate(self.tcx(), args);
context_after:                         write!(self, "#[target_features] ")?;