Fail if an old typed_ast version is installed

[JukkaL]

Users have had some hard-to-diagnose problems due to having a stale version of typed_ast. What if we failed hard if the installed typed_ast is older than what the release was tested with? We may need to include additional version information in typed_ast (such as __version__).

[gvanrossum]

I am hoping that #2340 will address this differently (by specifying
versioned dependencies) but I am stuck figuring out how to make
dependencies platform-specific. (See discussion there.)

On Mon, Oct 31, 2016 at 2:11 AM, Jukka Lehtosalo [email protected]
wrote:

Users have had some hard-to-diagnose problems due to having a stale
version of typed_ast. What if we failed hard if the installed typed_ast
is older than what the release was tested with? We may need to include
additional version information in typed_ast (such as version).

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[JukkaL]

I believe that #2452 fixed this.