diff options
Diffstat (limited to 'compiler/rustc_feature/src/tests.rs')
-rw-r--r-- | compiler/rustc_feature/src/tests.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/compiler/rustc_feature/src/tests.rs b/compiler/rustc_feature/src/tests.rs new file mode 100644 index 000000000..50433e44b --- /dev/null +++ b/compiler/rustc_feature/src/tests.rs @@ -0,0 +1,23 @@ +use super::UnstableFeatures; + +#[test] +fn rustc_bootstrap_parsing() { + let is_bootstrap = |env, krate| { + std::env::set_var("RUSTC_BOOTSTRAP", env); + matches!(UnstableFeatures::from_environment(krate), UnstableFeatures::Cheat) + }; + assert!(is_bootstrap("1", None)); + assert!(is_bootstrap("1", Some("x"))); + // RUSTC_BOOTSTRAP allows specifying a specific crate + assert!(is_bootstrap("x", Some("x"))); + // RUSTC_BOOTSTRAP allows multiple comma-delimited crates + assert!(is_bootstrap("x,y,z", Some("x"))); + assert!(is_bootstrap("x,y,z", Some("y"))); + // Crate that aren't specified do not get unstable features + assert!(!is_bootstrap("x", Some("a"))); + assert!(!is_bootstrap("x,y,z", Some("a"))); + assert!(!is_bootstrap("x,y,z", None)); + + // this is technically a breaking change, but there are no stability guarantees for RUSTC_BOOTSTRAP + assert!(!is_bootstrap("0", None)); +} |