syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // undesirable borrowck errors. During borrowck, we call `needs_drop`
context_before:                     // coroutine has to be live when dropped. This results in a lot of
context_after:                     // for the coroutine witness and check whether any of the contained types