I’m trying to use ReDim Preserve to copy the contents of an array within a user-defined type but I am getting an Object Required error (error number 424) at the line just before the ReDim in the following (as commented):
type _t1
i as integer
s as string
end type
type _t2
j as integer
t() as _t1
end type
type _t3
k as integer
t2() as _t2
end type
private function copy_t3(src as _t3) as _t3
dim copy as _t3
dim t2a(1 to 5, 1 to 5) as _t2 ' _t2 array used to copy the array's data
' Copy t3-level data
copy.k = src.k
t2a = src.t2 ' <<<< ERROR OCCURS HERE
redim preserve t2a(1 to 5, 1 to 5) as _t2
copy.t2 = t2a
end function
Sub Main
dim x as _t3
dim y(1 to 5, 1 to 5) as _t2
' fill y
for ii = 1 to 5
for jj = 1 to 5
y(ii,jj).j = ii * 10 + jj
' I'm ignoring the fact that _t2 contains an array for now...
next jj
next ii
x.t2 = y
dim cpy as _t3
cpy = copy_t3(x)
End Sub
I’ve spent all afternoon trying all sorts of syntax variations and trying to google an answer to no avail. As a relative noob to LibO Basic, I think I’m missing something. Does anyone have any ideas as to what? 
Or, if you have an example solution to the general problem of copying a user-defined data type, that’d be helpful too.
And to be clear, I’m looking for a duplicate variable, not just a pointer to the same copy of data. I want to change the data in cpy without changing the data in x.
Any pointers would be greatly appreciated! Thanks!!
C