syntax_data: {"ast_node_type":"function","tokens":[{"end":68,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn require_lang_item<I: Interner>(self, cx: I) -> I::DefId {
context_before:     /// Returns `DefId` of corresponding language item.
context_after:         cx.require_lang_item(match self {