syntax_data: {"ast_node_type":"impl","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
source_snippet: // This is not a derived impl because a derive would require `I: HashStable`
context_before: #[cfg(feature = "nightly")]
context_after: impl<CTX, I: Interner> HashStable<CTX> for RegionKind<I>