syntax_data: {"ast_node_type":"import","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // fields do. There can be no cycles here, because ADTs cannot contain themselves as
context_before:                 // ADTs are `needs_drop` exactly if they `impl Drop` or if any of their "transitive"
context_after:                 // fields.