Comapring two structs having arrays throws InvalidProgramException (“Invalid IL code”) at runtime

If a struct having array properties comparing two values of that type throws InvalidProgramException at runtime. The minimum reproducible code is here:

using System;

[Equals]
public struct FooBar {
    public FooBar(int[] foo, int[] bar) {
        Foo = foo;
        Bar = bar;
    }
    public int[] Foo { get; set; }
    public int[] Bar { get; set; }
}

public class Program {
    static void Main(string[] args) {
        var a = new FooBar(new[] { 1, 2 }, new[] { 3, 4 });
        var b = new FooBar(new[] { 1, 2 }, new[] { 3, 4 });

        if (a.Equals(b))
        {
            Console.WriteLine("They equal.");
        }
    }
}

This program crashes with an unhandled exception:

Unhandled Exception:
System.InvalidProgramException: Invalid IL code in FooBar:EqualsInternal (FooBar,FooBar): IL_0002: bne.un.s  IL_0010


  at FooBar.Equals (System.Object obj) [0x0003a] in <9c04883983e745dcaee8439101d7e69a>:0 
  at Program.Main (System.String[] args) [0x00047] in <9c04883983e745dcaee8439101d7e69a>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidProgramException: Invalid IL code in FooBar:EqualsInternal (FooBar,FooBar): IL_0002: bne.un.s  IL_0010


  at FooBar.Equals (System.Object obj) [0x0003a] in <9c04883983e745dcaee8439101d7e69a>:0 
  at Program.Main (System.String[] args) [0x00047] in <9c04883983e745dcaee8439101d7e69a>:0 

On the other hand, this runtime exception does not occur if it’s not a struct but a class.

I ran the above program on Mono 5.20.1.19 & macOS 10.14.2.

[SimonCropp]

Can u try 5.0.1 beta2 of fody

[SimonCropp]

@dahlia i have deployed 5.0.1 stable, sorry for the hassle