{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"///"}]}
    /// successors, which may be rendered differently between the text and the graphviz format.
    /// successor basic block, if any. The only information not included is the list of possible
    pub fn fmt_head<W: fmt::Write>(&self, fmt: &mut W) -> fmt::Result {