Macro sql_impl

macro_rules! sql_impl {
    {
        $ident:ident $(<
            $($lt:lifetime,)*
            $($generic:ident $(: $($generic_bound:tt)+)?),*
            $(,)?
        >)?;
        $apply_filter:ident ($apply_self:ident, $builder:ident) $apply_block:block
        $should_apply_filter:ident($should_self:ident) $should_apply_block:block
        $(where $($where_clause:tt)+)?
    } => { ... };
    {
        $ident:ident $(<$($lt:lifetime,)* $($generic:ident),* $(,)?>)?;
        $apply_filter:ident ($apply_self:ident, $builder:ident) $apply_block:block
        $should_apply_filter:ident($should_self:ident) $should_apply_block:block
    } => { ... };
    {
        $ident:ident $(<$($lt:lifetime)? $(,)? $($generic:ident),* $(,)?>)?;
        $apply_filter:ident (_, _) $apply_block:block
        $should_apply_filter:ident(_) $should_apply_block:block
    } => { ... };
}