Function walk_named_args 

fn walk_named_args<'hir>(
    ctx: &LintContext<'_, '_>,
    hir: &'hir Hir<'hir>,
    named_args: &Option<&'hir CallOptions<'hir>>,
    pending: &mut HashMap<VariableId, Span>,
)

Walk named call arguments (e.g. {value: expr, gas: expr}) for reads and writes.