{"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"type"}]}
    type Node = ConstraintSccIndex;
impl<'a, 'this, 'tcx> dot::Labeller<'this> for SccConstraints<'a, 'tcx> {
    type Edge = (ConstraintSccIndex, ConstraintSccIndex);