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