fn duplicate_assign()

in starlark/src/analysis/names.rs [112:144]

• 32 lines of code
• 7 McCabe index (conditional complexity)

fn duplicate_assign(
    codemap: &CodeMap,
    scope: &Scope,
    top: bool,
    res: &mut Vec<LintT<NameWarning>>,
) {
    // If I see two set's, without any intervening flow or get, the first one was pointless
    let mut warnings: HashMap<&str, _> = HashMap::new();
    let mut captured: HashSet<&str> = HashSet::new(); // those captured by child scopes
    for x in &scope.inner {
        match x {
            Bind::Set(reason, x) => {
                let ignored = !top && x.0.starts_with('_');
                if !ignored && !captured.contains(x.0.as_str()) {
                    if let Some((span, typ)) = warnings.insert(&x.node.0, (x.span, *reason)) {
                        res.push(NameWarning::unused(typ, codemap, span, x.0.clone()))
                    }
                }
            }
            Bind::Get(x) => {
                warnings.remove(x.node.as_str());
            }
            Bind::Scope(scope) => {
                duplicate_assign(codemap, scope, false, res);
                for x in scope.free.keys() {
                    warnings.remove(x.as_str());
                    captured.insert(x.as_str());
                }
            }
            Bind::Flow => warnings.clear(),
        }
    }
}