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Elixir & Phoenix

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The Wire · Showcase

ELIXIR FORMATTER GAINS ATOM INTERPOLATION MIGRATION TOOL

By RepoJournal · Filed · About Elixir & Phoenix

The core team is shipping a new formatter option to help developers migrate away from the soft-deprecated `:'foo#{x}'` syntax ahead of a future removal.

The Elixir formatter now includes a `migrate_atom_interpolations` option [1] that automatically rewrites interpolated atom literals to use `String.to_unsafe_atom/1` instead. This targets the deprecation warning developers have started seeing, and gives them a structured path forward. The core team already uses it internally to clean up their own codebase [2], signaling they're serious about this migration path. Meanwhile, routine dependency bumps landed overnight: actions/checkout upgraded to 7.0.0 [3] with improved security checks for fork PRs, and zizmor-action bumped to 0.5.7 [4] bringing zizmor 1.26.1 to the CI toolchain. A minor but welcome quality-of-life improvement also shipped: `Enum.reduce_while/3` now uses the `acc` alias in its type spec [5], making the signature easier to read at a glance.

Action items

References

  1. [1] Add :migrate_atom_interpolations option to formatter ↗ elixir-lang/elixir
  2. [2] Add :migrate_atom_interpolations option to formatter (#15531) elixir-lang/elixir
  3. [3] Bump actions/checkout from 6.0.3 to 7.0.0 ↗ elixir-lang/elixir
  4. [4] Bump zizmorcore/zizmor-action from 0.5.6 to 0.5.7 ↗ elixir-lang/elixir
  5. [5] Update `Enum.reduce_while/3` type spec to use `acc` ↗ elixir-lang/elixir

FAQ

What changed in Elixir & Phoenix on July 2, 2026?
The core team is shipping a new formatter option to help developers migrate away from the soft-deprecated `:'foo#{x}'` syntax ahead of a future removal.
What should Elixir & Phoenix teams do about it?
Run formatter with --migrate flag to preview atom interpolation migrations in your codebase • Update CI workflows to use actions/checkout 7.0.0 when you next touch your workflow files
Which Elixir & Phoenix repositories shipped on July 2, 2026?
elixir-lang/elixir

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