Warning on implicit conversion of Unit type to Object

[jl0pd]

F# allows to pass unit () to methods accepting object. It's not desired in most cases since it

1. Looks like regular method invocation
2. Unit always compiles to null, which means that we should've just pass null instead

Example:

let myObj = new object()
GC.KeepAlive()

Looks quite innocent, but in this case GC.KeepAlive does nothing, since it have only single overload KeepAlive: object? -> void. Compiler invokes this method as GC.KeepAlive(null) and by doing so hides important bug

[Xyncgas]

I guess you can pass anything to a method accepting object
A C# method in F# has to be called with () around the parameters, F# native methods don't have to