diff options
Diffstat (limited to 'compiler/rustc_feature/src/lib.rs')
| -rw-r--r-- | compiler/rustc_feature/src/lib.rs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs index 8e2a13a6c..93d167163 100644 --- a/compiler/rustc_feature/src/lib.rs +++ b/compiler/rustc_feature/src/lib.rs @@ -83,7 +83,8 @@ impl UnstableFeatures { /// Otherwise, only `RUSTC_BOOTSTRAP=1` will work. pub fn from_environment(krate: Option<&str>) -> Self { // `true` if this is a feature-staged build, i.e., on the beta or stable channel. - let disable_unstable_features = option_env!("CFG_DISABLE_UNSTABLE_FEATURES").is_some(); + let disable_unstable_features = + option_env!("CFG_DISABLE_UNSTABLE_FEATURES").map(|s| s != "0").unwrap_or(false); // Returns whether `krate` should be counted as unstable let is_unstable_crate = |var: &str| { krate.map_or(false, |name| var.split(',').any(|new_krate| new_krate == name)) |