`package.edition` gives confusing error when integer passed instead of string

[clarfonthey]

Problem

With the following in Cargo.toml: package.edition = 2021

You get the below error:

error: failed to parse manifest at `<dir>/Cargo.toml`

Caused by:
  data did not match any variant of untagged enum MaybeWorkspace for key `package.edition`

Ideally, this would point out to the user that only strings are allowed, not integers, since the current edition markers are all integer years.

[Muscraft]

Thanks for the report!

This is related to #10997 and caused by a problem with how cargo deserializes toml files and enum variants.

[weihanglo]

I believe it got improved with #11113. Closing. Thank you!

[clarfonthey]

Oh awesome, thank you for pointing this out. I tried to search for an existing error but couldn't find one.