{"ast_node_type":"function","tokens":[{"end":72,"kind":"keyword","start":0,"text":"fn"}]}
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
impl<Prov: Provenance> std::fmt::Debug for MPlaceTy<'_, Prov> {
        // Printing `layout` results in too much noise; just print a nice version of the type.