BRO1408: Remove a redundant base type

enum E : int and class C : object name what the declaration means anyway: an enum's underlying type is int and a class derives from object unless they say otherwise. Not a StyleCop rule (Roslynator RCS1042, Sonar S1939).

Example

Before

using System;

public enum Color : int
{
    Red,
    Green,
}

public class Shape : object, IDisposable
{
    public void Dispose()
    {
    }
}

After

using System;

public enum Color
{
    Red,
    Green,
}

public class Shape : IDisposable
{
    public void Dispose()
    {
    }
}

Why

A base type the compiler adds anyway suggests a choice that wasn't made: enum E : int reads like the size matters (for interop or serialization) when it is just the default.

How the fix works

The base type is removed with its : when it is the only one, or with the , after it when interfaces follow.

Not reported

• Enums with another underlying type (byte, long, ...). The check is semantic: int, Int32, System.Int32 and an alias of it are all reported.
• A base type named Object that isn't System.Object.
• A comment or directive in the removed text.

Compared with StyleCop

StyleCop has no such rule. stylebro-migrate turns it off (see Rules beyond StyleCop).