syntax_data: {"ast_node_type":"import","tokens":[{"end":78,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // case, because we can't return a new slice. But note that there are a couple
context_before: // `TypeFoldable` isn't impl'd for `&[T]`. It doesn't make sense in the general
context_after: // of trivial impls of `TypeFoldable` for specific slice types elsewhere.