Using a polynomial inside a function

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Here's a minimum (non)-working example: I have a function which returns a
polynomial:

mult(xs)==
  return(reduce(*,[x-z for z in xs]))

and I have another function which needs such a polynomial:

intm(xs,a,b)==
  g:=(x:Float):Float+->mult(xs)
  return(numeric(integrate(g(x),x=a..b)))

which doesn't work.  I've tried replacing the second line with

  function(mult(xs),g,x)

which works on the command line, but not in a function.  Any ideas as to
how I can get over this hump?

ever confused,
Alasdair

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<div dir=3D"ltr"><div><div><div><div><div><div><div><div><div><div><div>Her=
e&#39;s a minimum (non)-working example: I have a function which returns a =
polynomial:<br><br></div>mult(xs)=3D=3D<br></div>=C2=A0 return(reduce(*,[x-=
z for z in xs]))<br><br></div>and I have another function which needs such =
a polynomial:<br><br></div>intm(xs,a,b)=3D=3D<br></div>=C2=A0 g:=3D(x:Float=
):Float+-&gt;mult(xs)<br></div>=C2=A0 return(numeric(integrate(g(x),x=3Da..=
b)))<br><br></div>which doesn&#39;t work.=C2=A0 I&#39;ve tried replacing th=
e second line with<br><br></div>=C2=A0 function(mult(xs),g,x)<br><br></div>=
which works on the command line, but not in a function.=C2=A0 Any ideas as =
to how I can get over this hump?<br><br></div>ever confused,<br></div>Alasd=
air<br clear=3D"all"><div><div><div><div><div><div><div><div><div><div><div=
><div><br>-- <br><div class=3D"gmail_signature"><div dir=3D"ltr"><a href=3D=
"http://www.facebook.com/alasdair.mcandrew" target=3D"_blank"><img alt=3D"h=
ttp://www.facebook.com/alasdair.mcandrew" src=3D"https://dl.dropboxusercont=
ent.com/u/2796170/facebook.png"></a> <a href=3D"https://plus.google.com/+Al=
asdairMcAndrew/posts" target=3D"_blank"><img alt=3D"https://plus.google.com=
/+AlasdairMcAndrew/posts" src=3D"https://dl.dropboxusercontent.com/u/279617=
0/f-gplus_256-48.png"></a> <a href=3D"https://www.linkedin.com/pub/alasdair=
-mcandrew/a/178/108" target=3D"_blank"><img alt=3D"https://www.linkedin.com=
/pub/alasdair-mcandrew/a/178/108" src=3D"https://dl.dropboxusercontent.com/=
u/2796170/linkedin.png"></a> <a href=3D"https://twitter.com/amca01" target=
=3D"_blank"><img alt=3D"https://twitter.com/amca01" src=3D"https://dl.dropb=
oxusercontent.com/u/2796170/twitter.png"></a> <a href=3D"http://numbersands=
hapes.net" target=3D"_blank"><img alt=3D"http://numbersandshapes.net" src=
=3D"https://dl.dropboxusercontent.com/u/2796170/wordpress.png"></a><br></di=
v></div>
</div></div></div></div></div></div></div></div></div></div></div></div></d=
iv>

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