scala - Comparing Int to Double - No Warning? -


given following case classes:

scala> case class foo(x: int) defined class foo  scala> case class bar(x: int) defined class bar

the compiler shows warning when trying compare instances of different case classes.

scala> foo(5) == bar(5) <console>:15: warning: comparing case class values of types foo , bar using `==' yield false        foo(5) == bar(5)               ^ res8: boolean = false

but why doesn't following comparison give warning?

scala> (5 : int) == (10 : double) res9: boolean = false

because == overloaded method int, 1 of accepts double argument type (the same goes double, , many others). 100% legal.

abstract def ==(x: double): boolean

see scaladocs.


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