let f = f => f(f);
f(f)

# output:
stdin:1:14
  ╷
1 │ let f = f => f(f);
  ╵              ^
Error: Evaluation budget exceeded. This expression exceeds the maximum evaluation depth of 150.

stdin:1:15
  ╷
1 │ let f = f => f(f);
  ╵               ^
In call to function.

stdin:1:15
  ╷
1 │ let f = f => f(f);
  ╵               ^
In call to function.

stdin:1:15
  ╷
1 │ let f = f => f(f);
  ╵               ^
In call to function.

stdin:1:15
  ╷
1 │ let f = f => f(f);
  ╵               ^
In call to function.

stdin:1:15
  ╷
1 │ let f = f => f(f);
  ╵               ^
In call to function.

Note: The call stack is too deep to display in full. Only the innermost calls are shown above.