Suggestion: Require language definition version reference in all source files.

[ATell-SoundTheory]

trafficstars

In order to facilitate tool assisted migration when defaults or behaviours change, it would be sensible to have a mandatory reference to the language definition version that a source file is assuming.

This could be realised by importing a pseudo-package like import carbon.0.1, which is then detected by the compiler and used for the decision if the file can be processed or needs to be migrated first.

The migration tool would be able to understand the exact expected defaults and behaviour of the source file and increment the referred language definition version after the migration.

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