pub fn as_str(&self) -> Option<&str> {
        match *self {
            ValueKind::String(ref s) => Some(&**s),
            _ => None,
        }
    }
/// Extracts the string of this value if it is a string.
Extracts the string of this value if it is a string.
Extracts the string of this value if it is a string .
pub fn as_str(&self) -> Option<&str> {
        match *self {
            ValueKind::String(ref s) => Some(&**s),
            _ => None,
        }
    }
pub fn as_str ( & self ) -> Option < & str > { match * self { ValueKind :: String ( ref s ) => Some ( & * * s ) , _ => None , } }
Extracts the string of this value if it is a string.
Extracts the string of this value if it is a string .
&self