Minimum example needed to reproduce

Basically I have types in Rust like these:

#[derive(Clone, Debug, VmType, Pushable, Getable)]
enum E1 {
    S1(S),
}

#[derive(Clone, Debug, VmType, Pushable, Getable)]
struct S {
    e: E2,
}

#[derive(Clone, Debug, VmType, Pushable, Getable)]
enum E2 {
    Num(i32),
}

And if I try to initialize E1 with:

let { E1, S, E2 } = import! test
let e1 = S1 { e = Num 3 }

Then I get the following:

error: Expected the following types to be equal
Expected: | Num : Int -> E1
Found: E2
1 errors were found during unification:
Types do not match:
    Expected: Int -> E1
    Found: Int -> <opaque>
  ┌─ test:3:23
  │
3 │     let e1 = S1 { e = Num 3 }
  │
  │                       ^^^^^

So it seems like suddenly E2's constructor(s) have changed (if E2 has multiple variants they all get changed). Note that this also happens in the repl*, but (assuming test is the module containing the types) when I try :t import! test it shows all types correctly, but if I try :t let { E1 } = import! test in S1 then it also shows the wrong type.

[*] The repl included in the test repo is basically the one taken from gluon, except Color is removed and the repl is run from a provided Thread.