Rust: fix nightly toolchain version for tests using it

[redsun82]

Rather than fixing the version separately for each test, we can just request to use a nightly in the options.yml file, with the specific version hard-coded in qltest.rs. We can update it if we need to.

It's better to have a single nightly version for all tests that require it, in order to avoid downloading more versions than necessary.

Also removed some uneeded cargo check requests, as that flag is true by default on all tests.

[Copilot]

Pull Request Overview

Synchronize nightly toolchain usage across all ql tests by moving the version into the extractor logic and opting in via a single flag.

• Remove per-test rust-toolchain.toml files and add a global qltest_use_nightly option in each options.yml
• Introduce NIGHTLY constant and dump_nightly_toolchain() in qltest.rs, and wire up the qltest_use_nightly flag in Config
• Update the qltest_cargo template to parameterize the Rust edition and refresh .gitignore to exclude generated files

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rust/ql/test/query-tests/security/CWE-825/rust-toolchain.toml	Remove per-test toolchain file
rust/ql/test/query-tests/security/CWE-825/options.yml	Add qltest_use_nightly: true
rust/ql/test/query-tests/security/CWE-770/rust-toolchain.toml	Remove per-test toolchain file
rust/ql/test/query-tests/security/CWE-770/options.yml	Add qltest_use_nightly: true
rust/ql/test/query-tests/security/CWE-022/rust-toolchain.toml	Remove per-test toolchain file
rust/ql/test/query-tests/security/CWE-022/options.yml	Add qltest_use_nightly: true
rust/ql/test/.gitignore	Ignore generated rust-toolchain.toml, target/, etc.
rust/extractor/src/qltest_cargo.mustache	Parameterize edition in generated Cargo manifests
rust/extractor/src/qltest.rs	Add EDITION/NIGHTLY constants and dump_nightly_toolchain()
rust/extractor/src/config.rs	Introduce qltest_use_nightly in Config

Comments suppressed due to low confidence (2)

rust/extractor/src/qltest.rs:98

• The new qltest_use_nightly flag and dump_nightly_toolchain path lack dedicated tests. Add unit or integration tests to verify that enabling this flag generates the correct rust-toolchain.toml content.

    if config.qltest_use_nightly {

rust/ql/test/.gitignore:5

• This pattern only ignores rust-toolchain.toml at the repo root. Generated toolchain files in subdirectories won’t be ignored—consider using **/rust-toolchain.toml.

rust-toolchain.toml