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[Embedded] Remove the ability to disable existentials in Embedded Swift#88541

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DougGregor wants to merge 1 commit intoswiftlang:mainfrom
DougGregor:no-disable-embedded-existentials
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[Embedded] Remove the ability to disable existentials in Embedded Swift#88541
DougGregor wants to merge 1 commit intoswiftlang:mainfrom
DougGregor:no-disable-embedded-existentials

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@DougGregor
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  • Explanation: Support for existentials in Embedded Swift has been available for a little while now and appears to be solid. Remove the ability to disable them (via -disable-experimental-feature EmbeddedExistentials), both because it simplifies the code and because it's an ABI break to disable the feature.
  • Scope: Limited to Embedded Swift
  • Risk: Low. Removing a default-off feature that shouldn't be used by anyone.
  • Testing: CI, updated a bunch of tests

Support for existentials in Embedded Swift has been available for a
little while now and appears to be solid. Remove the ability to disable
them (via `-disable-experimental-feature EmbeddedExistentials`), both
because it simplifies the code and because it's an ABI break to
disable the feature.
@DougGregor DougGregor requested a review from a team as a code owner April 18, 2026 00:40
@DougGregor
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@swift-ci please test

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🥳

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