syntax_data: {"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"FromStr::from_str(&s).map_err(serde::de::Error::custom)"}]}
source_snippet:                 FromStr::from_str(&s).map_err(serde::de::Error::custom)
context_before:                 let s = String::deserialize(deserializer)?;
context_after:             }