syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // and the span isn't "imported" (i.e. from unavailable sources).
context_before:             // Only return something if it doesn't overlap with the original span,
context_after:             // FIXME: This does limit the usefulness of the error when the macro is