syntax_data: {"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"assert!(!item_type.has_erasable_regions());"}]}
source_snippet:         assert!(!item_type.has_erasable_regions());
context_before:         // ought to be the same for every reference anyway.
context_after:         hcx.while_hashing_spans(false, |hcx| {