91752f02da
Following on from de652e22a26b, this introduces deprecation warnings for when an attribute value expression is a template with only a single interpolation sequence, and for variable type constraints given in quotes. As with the previous commit, we allowed these deprecated forms with no warning for a few releases after v0.12.0 to ensure that folks who need to write cross-compatible modules for a while during upgrading would be able to do so, but we're now marking these as explicitly deprecated to guide users towards the new idiomatic forms. The "terraform 0.12upgrade" tool would've already updated configurations to not hit these warnings for those who had pre-existing configurations written for Terraform 0.11. The main target audience for these warnings are newcomers to Terraform who are learning from existing examples already published in various spots on the wider internet that may be showing older Terraform syntax, since those folks will not be running their configurations through the upgrade tool. These warnings will hopefully guide them towards modern Terraform usage during their initial experimentation, and thus reduce the chances of inadvertently adopting the less-readable legacy usage patterns in greenfield projects. |
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