Cannot interpret nested call statements in return

[kobbled]

local := R[70..80]

def func2(val, exp) : numreg
  return(Mth::exp(exp * Mth::ln(val)))
end

power := R[20]
power = ns1::func2(4, 2)

gives error:

indirect_node.rb:70:in `id': undefined method `value' for #<TPPlus::Nodes::ArgumentNode:0x000001f424c699f8 @id=3, @comment=:ret> (NoMethodError)

        @target.value\r

[kobbled]

Current work around is to put it outside of return using a local register

local := R[70..80]

def func2(val, exp) : numreg
  num := LR[]
  num = Mth::exp(exp * Mth::ln(val))
  return(num)
end

power := R[20]
power = ns1::func2(4, 2)