syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"Self::I128"}]}
source_snippet:             Self::I128 => f.write_str("i128"),
context_before:             Self::I64 => f.write_str("i64"),
context_after:             Self::F16 => f.write_str("f16"),