To reproduce:

1. Download attached project "AnimationInconsistent.zip" and open in Unity
2. Double click on "ImportInEmptyProjectForCrash..unitypackage"
3. On Import window press "All" button and the "Import"

Expected Result: Unity successfully Imports Odin 1.0.3.0 asset
Actual Result: Unity Editor stops working and no Stack Trace is generated

To reproduce from scratch:
1. Set an empty Unity project to use .NET 4.6
2. Import Odin 1.0.3.0 (User attached a .unitypackage containing this version of Odin)
3. Make a "Test.cs" MonoBehaviour script, and wait for all recompiles to finish
4. Export the whole project as a .unitypackage, make sure to include Odin in the package export
5. Create another new project and set it to use .NET 4.6
6. Import the package you exported.

Note: This issue appears both on Windows and OSX.
Note: This only happens when the experimental.NET 4.6 backends are enabled.

Reproduced on Unity 2017.1.0a6, 2017.1.0f3 and 2017.2.0b2
Not reproduced on Unity 5.5.4p2, 5.6.2p3 and 2017.1.0a5
Regression on Unity 2017.1.0a6