{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"//"}]}
        // 2. The span references a file from crate C. This makes it a 'foreign' span,
        // which means that we can use crate B's serialized source map information.
        // which means we need to use Crate *C* (not crate B) to determine the source