syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"Mutability::Mut"}]}
source_snippet:             Mutability::Mut => (LangItem::DerefMut, sym::deref_mut),
context_before:             Mutability::Not => (LangItem::Deref, sym::deref),
context_after:         };