syntax_data: {"ast_node_type":"import","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // type is actually unit. Otherwise there will be no defining use found in the MIR.
context_before:             // Opaque types of empty bodies also need this unit assignment, in order to infer that their
context_after:             if destination_ty.is_unit()