IMO, make some syntax element that means "each line indented from this one has one single element, unless indented further".

    eq :
        mul a a
        pow a 2

    defun min (a b) :
        if (< a b) a b

That means you can also have haskell-like continuations:

    seq :
        eq (mul a a)
            (pow a 2)
        eq 4 3