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Rollup merge of #89730 - crlf0710:type_changing_feature, r=jackh726

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add feature flag for `type_changing_struct_update`

This implements the PR0 part of the mentoring notes within #86618.

overrides the previous inactive #86646 pr.

r? ```@nikomatsakis```
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Matthias Krüger 2021-10-23 05:28:22 +02:00 • committed by GitHub
commit 736e8ebd1c
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4
compiler/rustc_feature/src/active.rs
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@ -684,6 +684,10 @@ declare_features! (
/// Allows using the `non_exhaustive_omitted_patterns` lint.
(active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
/// Allows creation of instances of a struct by moving fields that have
/// not changed from prior instances of the same struct (RFC #2528)
(incomplete, type_changing_struct_update, "1.58.0", Some(86555), None),
// -------------------------------------------------------------------------
// feature-group-end: actual feature gates
// -------------------------------------------------------------------------