Function self_arg_requires_default_perm 

pub(crate) fn self_arg_requires_default_perm<'db>(
    db: &'db dyn Db,
    decl: AstSelfArg<'db>,
    scope: &Scope<'_, 'db>,
) -> bool

Returns true if a self arg requires a default permission. See PopulateDefaultSymbols trait for examples.