Area-CompilersBughelp wanted
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Description
The compiler emits unnecessary defensive copies on enums passed by in.
Version Used:
Sharplab.io Also reproduces with the compiler included in the .NET 8.0.100 SDK
Steps to Reproduce:
using System;
public class C
{
public void M<T1, T2>(in Enum1 value1, ref Enum1 value2, Enum1 value3, in T1 value4, in T2 value5) where T1 : Enum where T2 : struct, Enum
{
value1.ToString(); //defensive copy (unnecessary)
value2.ToString(); //no defensive copy
value3.ToString(); //no defensive copy
value4.ToString(); //defensive copy (unnecessary)
value5.ToString(); //defensive copy (unnecessary)
}
}
public enum Enum1
{
}
Expected Behavior:
None of the calls to .ToString() emit a defensive copy, since none is required for any of them.
Actual Behavior:
value1.ToString() emits a defensive copy, and similar for value4 and value5.