syntax_data: {"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let val = Double::try_from(int).unwrap();
context_before:                 ty::FloatTy::F64 => {
context_after:                     write!(self, "{}{}f64", val, if val.is_finite() { "" } else { "_" })?;