Changed

• merge_imports configuration has been deprecated in favor of the new imports_granularity option. Any existing usage of merge_imports will be automatically mapped to the corresponding value on imports_granularity with a warning message printed to encourage users to update their config files.

Added

• New imports_granularity option has been added which succeeds merge_imports. This new option supports several additional variants which allow users to merge imports at different levels (crate or module), and even flatten imports to have a single use statement per item. (PR #4634, PR #4639)

See the section on the configuration site for more information https://rust-lang.github.io/rustfmt/?version=v1.4.33&search=#imports_granularity

Fixed

• Fix erroneous removal of const keyword on const trait impl (#4084)
• Fix incorrect span usage wit const generics in supertraits (#4204)
• Use correct span for const generic params (#4263)
• Correct span on const generics to include type bounds (#4310)
• Idempotence issue on blocks containing only empty statements (#4627 and #3868)
• Fix issue with semicolon placement on required functions that have a trailing comment that ends in a line-style comment before the semicolon (#4646)
• Avoid shared interned cfg_if symbol since rustfmt can re-initialize the rustc_ast globals on multiple inputs (#4656)