syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // not working, so just hack around it by grabbing the parent fn's span.
context_before:                     // def_span code. I'm not motivated to fix it, because I tried and it was
context_after:                     let span = if coroutine_kind.is_fn_like() {