## Test

```catala
declaration enumeration T:
   -- C content boolean
   -- D content integer

declaration enumeration S:
    -- A content integer
    -- B content T

declaration scope A:
  output x content integer
  internal y content S

scope A:
  definition y equals B content (D content 1)
  definition x under condition match y with pattern -- A of a: true -- B of b: false consequence equals 0
  definition x under condition match y with pattern -- A of a: false -- B of b: true consequence equals 1
```


```catala-test-inline
$ catala Typecheck --check-invariants
┌─[WARNING]─
│
│  The constructor "C" of enumeration "T" is never used;
│  maybe it's unnecessary?
│
├─➤ tests/proof/good/enums.catala_en:5.7-5.8:
│   │
│ 5 │    -- C content boolean
│   │       ‾
└─ Test
┌─[RESULT]─
│ All invariant checks passed
└─
┌─[RESULT]─
│ Typechecking successful!
└─
```

```catala-test-inline
$ catala Proof --disable-counterexamples 
┌─[WARNING]─
│
│  The constructor "C" of enumeration "T" is never used;
│  maybe it's unnecessary?
│
├─➤ tests/proof/good/enums.catala_en:5.7-5.8:
│   │
│ 5 │    -- C content boolean
│   │       ‾
└─ Test
┌─[RESULT]─
│ No errors found during the proof mode run.
└─
```