syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"Mutability::Not"}]}
source_snippet:         Mutability::Not => vec![Conflict::Ref { span: pat.span, name }],
context_before:         Mutability::Mut => vec![Conflict::Mut { span: pat.span, name }],
context_after:     };