fn unused_variable()

in starlark/src/analysis/names.rs [146:177]

• 28 lines of code
• 10 McCabe index (conditional complexity)

fn unused_variable(codemap: &CodeMap, scope: &Scope, top: bool, res: &mut Vec<LintT<NameWarning>>) {
    let mut warnings = HashMap::new();
    for (x, (typ, span)) in &scope.bound {
        let exported = top && *typ == Assigner::Assign && !x.starts_with('_');
        let ignored = !top && x.starts_with('_');

        // We don't want to warn about exported things or ignored things
        if !exported && !ignored {
            warnings.insert(x, (*typ, *span));
        }
    }

    for x in &scope.inner {
        match x {
            Bind::Set(..) => {}
            Bind::Get(x) => {
                warnings.remove(&x.node);
            }
            Bind::Scope(scope) => {
                unused_variable(codemap, scope, false, res);
                for x in scope.free.keys() {
                    warnings.remove(x);
                }
            }
            Bind::Flow => {}
        }
    }

    for (name, (typ, span)) in warnings {
        res.push(NameWarning::unused(typ, codemap, span, name.clone()))
    }
}