Lack of error from language service masks build error in error list

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#6,036 opened on Dec 19, 2018 1 comment 0 reactions 0 assignees View on GitHub

AI-thinks-windows-only Area-LangService-Diagnostics Bug Impact-Medium

Description

Use #6035, noting that there is nothing in the Error List by default (Build + IntelliSense).

Now build the project, noting that it fails. Look at the error list:

![image](https://user-images.githubusercontent.com/6309070/50251423-b64e2e00-0398-11e9-9b71-8f008d0b58d8.png)

Now switch to "Build only":

![image](https://user-images.githubusercontent.com/6309070/50251466-d0880c00-0398-11e9-9bca-7a71bfcaadf2.png)

The expectation is that for Build + IntelliSense, you'd see the FS0247 error.

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