Fix workspace feature handling to filter features per-package

[tautschnig]

The --features flag was being applied globally to all packages in a workspace, causing failures when packages don't all declare the same features. This change filters requested features for each package based on what that package actually defines in its features BTreeMap.

Added regression test for --workspace --features with mixed features.

Co-authored-by: Kiro autonomous agent

Resolves #4544

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

[Copilot]

Pull request overview

This PR fixes a bug where cargo kani --workspace --features <feature> would fail when workspace members don't all declare the requested features. The fix filters features per-package to match cargo's standard behavior, where features are only applied to packages that declare them.

Changes:

• Modified feature handling in call_cargo.rs to filter features per-package instead of applying them globally
• Added filter_features_for_package() function to check which features each package declares
• Added comprehensive regression test with a workspace containing packages with different feature sets

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
kani-driver/src/call_cargo.rs	Core fix: features are now filtered per-package and added to individual cargo commands instead of globally
tests/script-based-pre/workspace_features/workspace_features.sh	Test script verifying the fix works with various flag combinations
tests/script-based-pre/workspace_features/workspace_features.expected	Expected output for the test
tests/script-based-pre/workspace_features/mytests/src/lib.rs	Test crate with use_mylib feature defined
tests/script-based-pre/workspace_features/mytests/Cargo.toml	Test crate manifest defining the use_mylib feature
tests/script-based-pre/workspace_features/mylib/src/lib.rs	Test library with no features (to reproduce the issue)
tests/script-based-pre/workspace_features/mylib/Cargo.toml	Test library manifest with no features section
tests/script-based-pre/workspace_features/config.yml	Test configuration
tests/script-based-pre/workspace_features/Cargo.toml	Workspace manifest for the test

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[zhassan]

Looks good. Thanks for the quick fix!