syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"type"}]}
source_snippet:     type Item = I::GenericArg;
context_before: impl<'a, I: Interner> IntoIterator for &'a CanonicalVarValues<I> {
context_after:     type IntoIter = <I::GenericArgs as SliceLike>::IntoIter;