syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"hcx.while_hashing_spans(false,"}]}
source_snippet:         hcx.while_hashing_spans(false, |hcx| {
context_before:         assert!(!item_type.has_erasable_regions());
context_after:             item_type.hash_stable(hcx, &mut hasher);