## Article

```catala
declaration enumeration E:
  -- C1
  -- C2

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

scope A:
  definition x equals C1
  definition y under condition x = C1 consequence equals 1
  definition y under condition x = C2 consequence equals 2
```



```catala-test-inline
$ catala Typecheck --check-invariants
┌─[RESULT]─
│ All invariant checks passed
└─
┌─[RESULT]─
│ Typechecking successful!
└─
```

```catala-test-inline
$ catala Proof --disable-counterexamples 
┌─[RESULT]─
│ No errors found during the proof mode run.
└─
```