Makefile

.PHONY: all run clean

all: Repro13734.exe

Repro13734.exe: Repro13734.cs Point.dll
	csc -r:Point.dll Repro13734.cs

Point.dll: Point.cs
	csc -target:library Point.cs

run:
	-rm -f Point.dll
	mono Repro13734.exe

clean:
	-rm -f Point.dll Repro13734.dll

Point.cs

public struct Point {
	public int X;
}

Repro13734.cs

using System;
using System.Runtime.InteropServices;

// The crash happens when we init an auto layout valuetype with a field from a missing assembly.
[StructLayout (LayoutKind.Auto)]
public struct H<T> {
	public T TheOne;
	public T TheOther;
}

public struct B {
	public Point X;

	public B (Point a)
	{
		X = a;
	}
}

public class C {
	public H<B> floof;
	public C () { }
}

public class M {
	public static void Main () {
		_ = new C();
	}
}