Haskell generator fails to distinguish between multiple enum types with conflicting enum identifiers

When the Haskell generator generate the data type like this

enum Sample1

enum Sample2

Output will be like this

data Sample1 = A|B|C
– ...
data Sample2 = C|D|E

And this will make a compile error "Multiple declarations of ‘C’".
So I modified this to generate like this

data Sample1 = Sample1_A|Sample1_B|Sample1_C
– ...
data Sample2 = Sample2_C|Sample2_D|Sample2_E