ModuleInit VS ILSpy

Module initializers are a kinda obscure feature of .NET that allows writing initialization code for an assembly. They allow libraries to do one-time initialization when loaded, without the need for the user to explicitly call anything. It's a quite niche feature, but unfortunately it was not exposed in C#, and that led to users finding their own way of using it, like with ModuleInit.Fody. Given the need for it, Microsoft then decided to add it in supported platform starting from C# 9.0.

First, go grab this: https://github.com/icsharpcode/ILSpy. It's a decompiler that will break Rust down. Hope you like C#.

If its a C#/.NET exe you can use ILSpy to get the source code https://github.com/icsharpcode/ILSpy

Well, it might not be exactly what you're asking for, but ILSpy lets you choose what version of C# you wish to decompile an assembly to. This is great for learning how a specific feature used to be coded in C# prior to some new syntax/compiler feature being added.

You will thoroughly enjoy this, then.

I've only used their GUI frontend myself, but ILSpy is also available as a library and command line tool.

As you can see IL code is not exactly human readable, and it's also quite verbose. If you want to have an idea of how your code looks like in IL you can use a decompiler tool such as JustDecompile or ILSpy.

Take a random piece of C# software, run it through ILSpy, and be amazed at the results.