chore: warn on implicit __init__.py creation#3841
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Warn users when targets rely on deprecated implicit __init__.py creation to encourage migration to explicit inits. We add a formatted multiline warning block inside the execution path of `_should_create_init_files(ctx)` in `py_executable.bzl`. The warning identifies the offending target by label and provides instructions on how to explicitly create inits or disable the warning.
Add a changelog news entry for the newly introduced deprecation warning on implicit __init__.py creation.
Clarify in the warning message that implicit __init__.py creation will be disabled by default (rather than completely removed) in a future release.
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This pull request introduces a deprecation warning for targets relying on implicit __init__.py creation. The review feedback suggests using more professional language by replacing the word "diabolic" and recommends condensing the multi-line warning message into a single line to prevent excessive console noise in large workspaces.
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Implicit
__init__.pycreation is deprecated and will be disabled by default in a future release. We need to warn users when their targets rely on this behavior so they can transition to explicit__init__.pyfiles before the default changes and their builds break.Work towards #2945