Backport of configs: Accept and minimally validate a "language" argument into v0.15 #27942
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Backport
This PR is auto-generated from #27941 to be assessed for backporting due to the inclusion of the label 0.15-backport.
The below text is copied from the body of the original PR.
We expect that in order to continue to evolve the language without breaking existing modules we will at some point need to have a way to mark when a particular module is expecting a newer interpretation of the language.
Although it's too early to do any deep preparation for that, this commit aims to proactively reserve an argument named "language" inside "terraform" blocks, which currently only accepts the keyword
TF2021
that is intended to represent "the edition of the Terraform language as defined in 2021".Since
TF2021
represents the language as currently defined without settinglanguage
, in practice there's no real reason to set this today, but this minimal validation is intended to give better feedback to users of older Terraform versions in the event that we introduce a new language edition later and they try to use an module incompatible with their Terraform version. Specifically, it will recommend that they upgrade to a newer version rather than just reporting that thelanguage
argument isn't supported.This is a v0.15 backport because this change will meet its goals best if it's included in as early a Terraform CLI release as possible, to minimize the number of pre-0.15 uses of Terraform still around at the point where we might introduce a new edition keyword.