syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"ty::FloatTy::F128"}]}
source_snippet:                     ty::FloatTy::F128 => v.to_f128().is_nan(),
context_before:                     ty::FloatTy::F64 => v.to_f64().is_nan(),
context_after:                 };