Update CHANGELOG for v1.9.0 release#6811

Merged

ytmimi merged 16 commits intorust-lang:mainfrom

ytmimi:update_changelog

Feb 26, 2026

Commits on Feb 25, 2026

chore: Add CHANGELOG details for `float_literal_trailing_zero`
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chore: add CHANGELOG details for `required_version` semver support
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chore: Update CHANGELOG entry for `match_arm_indent`
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chore: add CHANGELOG entry for idempotent import fix
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chore: add CHANGELOG entry for proper wrapping of long `if-let` pattern
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chore: add changelog entry for `lazy_static::lazy_static!` formatting
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chore: add CHANGELOG entry for properly handleing unicode whitespace chars in missing spans
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chore: add CHANGELOG entry for Allow `NotADirectory` errors
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chore: add changelog entry for transitive import sorting for style_edition=2015|2018|2021
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chore: add CHANGELOG entry for Properly wrapping long `impl trait` parameters
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chore: add CHANGELOG entry for `imports_granularity=Module` changes
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chore: add CHANGELOG entry for misc dependency upgrades
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chore: add CHANGELOG entry for temporary removal of generic-simd support
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chore: update date when I think rustfmt v1.9.0 will get synced
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chore: add CHANGELOG entry for `trailing_semicolon` changes for last loop expression
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chore: add CHANGELOG entry for deduplicate imports when `imports_granularity=Module`
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