syntax_data: {"ast_node_type":"enum","tokens":[{"end":63,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// not necessary to extend the argument, this enum is ignored.
context_before: /// defines if this extension should be zero-extension or sign-extension when necessary. When it is
context_after: #[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, HashStable_Generic)]