New Features

  • Cargo features and cfg support improvements:

    • #6497 Take into account attributes under cfg_attr attribute during type inference, name resolution, and other analysis. Now the corresponding features work as expected with code containing attributes like cfg_attr(..., derive(...)), cfg_attr(..., path="..."), etc.

    • #6549 Fairly evaluate unknown cfg options to false if there is no custom build script (build.rs) in the package. Previously, in order to avoid wrongly disabling the actual code, unknown cfg options and unknown Cargo features were considered enabled and disabled simultaneously. Note, you can turn on the new logic for packages containing build.rs as well by enabling the experimental build script evaluation: just enable org.rust.cargo.evaluate.build.scripts in Help | Find Action | Experimental Features dialog

    • #6507 Improve cfg(test) processing for external dependencies by providing a new heuristic. Now cfg(test) is treated as disabled if there is a cfg(not(test)) condition in the project. Previously, test option was considered enabled and disabled simultaneously, i.e. code under cfg(test) and cfg(not(test) was both enabled. Such test attributes are quite complex to handle in the IDE: the tests should not be conditionally disabled since you might want to read and edit them at any time; but only mock objects should be disabled and excluded from code analysis. So the current logic behind that is to disable “test” code only when “mocking”, i.e. when there is a cfg(not(test)) somewhere in the code. Note, this new logic currently affects the external dependencies only, excluding your workspace, in order not to break down the code insight for your tests.

  • #5913 Introduce rename refactoring suggestions for local variables. Now you will see a special hint to rename all usages when changing a local variable name in the editor (by @Kobzol)

  • #6582 Add basic support for overridden toolchains. Note, multiple overridden toolchains in a single IDE project are still unsupported

  • #6553 Resolve URLs in Cargo.toml (e.g. in dependency git links). Now you can open URL specified in git, homepage, repository, and documentation fields (by @Kobzol)

  • #6084 Provide folding for TOML files. Currently, it supports tables, arrays, and custom folding regions (by @Kobzol)

  • #6120 Highlight string-formatting arguments of panic! macro

  • #6439 Incrementally update experimental local crates index. This speeds up the experimental Cargo.toml dependency completion. In the future, this would affect other new code insight based on the local crates index as well. Note, the corresponding feature is disabled by default for now. You can enable it via org.rust.crates.local.index option in Experimental Feature dialog (Help | Find Action and type Experimental features to open the dialog)

Fixes

  • New name resolution engine improvements:

    • #6576 Support #![macro_use] attribute at file level

    • #6543 Consider textual scoping when resolving macros

    • #6568 Properly process items with restricted visibility that contains an absolute path, e.g. pub(in crate::inner1)

    • #6566 Fix name resolution of qualified macro calls inside items in some cases

    • #6545 Properly handle renaming of enum variants

    Note, you can enable the new engine via Use experimental name resolution engine option in Preferences | Languages & Frameworks | Rust settings

  • #6606 Fix name resolution and completion of Self keyword for nested structs, enums, and impl blocks

  • #6613 Improve the new Fill function arguments quick-fix (by @Kobzol)
    • Support filling arguments of a closure call
    • Take actual types into account when constructing default values of generic types

  • #6515 Remove parameter quick-fix no longer removes references to the modified function (by @Kobzol)

  • #6574 Fix resolution of Cargo features for aliased packages like foo_alias = { package = "foo", path = "../foo"}

  • #6588 Fix Trait implementation inspection on impl blocks containing macro-expanded members

  • #6541, #6542 Improve parser recovery and syntax error messages for incomplete paths

Internal Improvements

  • #6578 Introduce TomlVisitor. This class can be used to implement inspections in TOML files in a simple and efficient way (by @Kobzol)

  • #6555 Introduce message bundle to collect user-visible string literals and localize them in the future

  • #6538 Set milestones automatically for pull requests from forks. Previously, it worked only for pull requests in the original repository

  • #6534 Provide regression testing on CI for stdlib packages

Full set of changes can be found here