Macro rustc_span::span_encoding::match_span_kind

macro_rules! match_span_kind {
    (
        $span:expr,
        InlineCtxt($span1:ident) => $arm1:expr,
        InlineParent($span2:ident) => $arm2:expr,
        PartiallyInterned($span3:ident) => $arm3:expr,
        Interned($span4:ident) => $arm4:expr,
    ) => { ... };
}