Revert "Fix crash when serializing the return type of a generic call …

[amcasey]

…to Array.prototype.flat (#38904) (#39079)"

This reverts commit 986e9dd.

[amcasey]

@typescript-bot pack this

[typescript-bot]

Heya @amcasey, I've started to run the tarball bundle task on this PR at 5400152. You can monitor the build here.

[amcasey]

@typescript-bot pack this

[typescript-bot]

Heya @amcasey, I've started to run the tarball bundle task on this PR at 1dd4b78. You can monitor the build here.

[typescript-bot]

Hey @amcasey, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/79057/artifacts?artifactName=tgz&fileId=8070EBDEC994D6ADDA19D890BCF6E0FE3D67A857CFC7E8A32BCD6B2114FB94FF02&fileName=/typescript-3.9.6-insiders.20200707.tgz"
    }
}

and then running npm install.

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There is also a playground for this build.