If this is an enum with explicit type conversion and never be referenced by other const, it will not be evaluated

[sdghchj]

Describe the bug
If this is an enum with explicit type conversion and never be referenced by other const, it will not be evaluated.

To Reproduce
For example:

type Class int

const (
     CA Class = iota + 1
     CB 
)

type Kind int

const (
     KA = Kind(1 + 2)
     KB  = Kind(CA + CB)
)

Expected behavior
KA, KB should be enums of type Kind