st: saved local macro

["Paul O'Brien" <paul.obrien@afe2.org.uk>]

i have a small program cu7 with a saved local macro:
program cu7, rclass
local numd 1
return local numd =`numd'
end

but using the program in an ado:
cu7
if r(numd) == 1 {
display r(numd)
}

i get:
. cu7
. if r(numd) == 1 {
type mismatch

yet this works:
local numd  1
if `numd' == 1 {
display `numd'
}

. local numd  1
. if `numd' == 1 {
. display `numd'
1
. }

and Stata is interpreting numd as 1:
. cu7
. display r(numd)
1
. return list
macros:
               r(numd) : "1"

where am i going wrong?

thanks,

paul
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