syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // FIXME: leaking this is kind of weird: we're feeding these into something that expects an
context_after:     // `AsRef<OsStr>`, but often converts to `OsString` anyways, so shouldn't we just demand an `OsString`?