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Project build fails when using a folder named "Editor" in a folder that has an Assembly Definition



How to reproduce:
1. Open user's attached project
2. Open Scene "SampleScene"
3. Go to File > Build Settings.. and click Add Open Scenes
4. Build the project

Expected result: project builds without errors
Actual result: errors such as "error CS0246: The type or namespace name 'PropertyDrawer' could not be found (are you missing a using directive or an assembly reference?)" appear

Reproducible with: 2018.4.26f1, 2019.4.6f1, 2020.1.0f1, 2020.2.0a19

-You can make it build successfully by moving the "Editor" folder out of the "Framework" (this folder has an Assembly Definition) folder

  1. Response avatar

    Resolution Note:
    "Unity normally compiles any scripts in folders named Editor into the predefined Assembly-CSharp-Editor assembly no matter where those scripts are located. However, if you create an Assembly Definition Asset in a folder that has an Editor folder underneath it, Unity no longer puts those Editor scripts into the predefined Editor assembly. Instead, they go into the new assembly created by your Assembly Definition — where they might not belong. To manage Editor folders, you can do the following:

    1. Add an Assembly Definition Asset to each affected Editor folder and set the Platform property of that assembly so it is only used for the Editor Platform.
    2. Move all editor specific code to a central location not covered by an Assembly Definition."

    In this case you would want to go with solution #1 from what I understand what you're trying to do :)

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