`code_warntype` understanding

New to Julia
, ,
23

In the example below, if I comment the line marked with # !!!!!!!!!! I get ::Any.

module MyTest2
    using Parameters
    function build_model(list_of_settings)
        function model(x; pars)
            return sum(p*single_term_model(x; settings=s)
                for (p,s) in zip(pars, list_of_settings))
        end
        return model
    end
    function single_term_model(x; settings)
        @unpack N, k, p = settings
        value = sum((k*x)^i*cis(i*p*x) for i in 1:N)
        return value
    end
    export build_model
end

using .MyTest2

const list_of_settings = [(N=3,k=0.1,p=0.3),
                    (N=5,k=0.5,p=0.3),
                    (N=7,k=0.2,p=0.3)]
#
#!!!!!!!!!!
# @code_warntype MyTest2.single_term_model(2.2; settings=list_of_settings[1]) # correct! Complex{Float}
#!!!!!!!!!!
# 
const model = build_model(list_of_settings)

@code_warntype model(2.2; pars=[1.0, 1.0, 1.0]) # Body::Any

As soon as I uncomment the line, I get Body::Complex{Float64}