syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                         write!(self, "#[target_features] ")?;
context_before:                     if self.tcx().codegen_fn_attrs(def_id).safe_target_features {
context_after:                         sig = sig.map_bound(|mut sig| {