Inconsistency in handling implicit conversion `Null => Int`

[sir-wabbit]

Either both should compile or neither.

scala> def foo(b: Null): Int = b
                               ^
       error: an expression of type Null is ineligible for implicit conversion

scala> def foo(b: Null with Null): Int = b
foo: (b: Null with Null)Int

[SethTisue]

heh — Scala 3 (I tested 3.4.0) can be bamboozled in the same way