pub fn as_nested(&self) -> Option<&MacroAttribute> {
        match self {
            MetaItem::Nested(x) => Some(x),
            _ => None,
        }
    }
/// Returns a reference to this meta item as a nested macro attribute or `None` if is not a macro attribute.
Returns a reference to this meta item as a nested macro attribute or `None` if is not a macro attribute.
Returns a reference to this meta item as a nested macro attribute or ` None ` if is not a macro attribute .
pub fn as_nested(&self) -> Option<&MacroAttribute> {
        match self {
            MetaItem::Nested(x) => Some(x),
            _ => None,
        }
    }
pub fn as_nested ( & self ) -> Option < & MacroAttribute > { match self { MetaItem :: Nested ( x ) => Some ( x ) , _ => None , } }
Returns a reference to this meta item as a nested macro attribute or `None` if is not a macro attribute.
Returns a reference to this meta item as a nested macro attribute or ` None ` if is not a macro attribute .
&self
&self