syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// (It might still be nightly-only even if this returns `true`, so make sure to also check
context_before:     /// Returns whether the feature may be toggled via `#[target_feature]` or `-Ctarget-feature`.
context_after:     /// `requires_nightly`.)