Assigning a value to a local variable by calling another function failed¶

When the result of a function is used for a local variable in another function, an error -108 occurred.

dim stest 
let stest=1234 
return stest

All is fine. When the function is:

dim stest 
let stest={@Function3} 
return stest

Error: -108, Symbol 'stest' not defined.
on line: 2 column: 5