Read default cfgs from rustc

1 files changed, 10 insertions, 0 deletions

diff --git a/crates/ra_cfg/src/lib.rs b/crates/ra_cfg/src/lib.rs
index dd81a73f4..e1c92fbba 100644
--- a/crates/ra_cfg/src/lib.rs
+++ b/crates/ra_cfg/src/lib.rs
@@ -1,4 +1,6 @@
 //! ra_cfg defines conditional compiling options, `cfg` attibute parser and evaluator
+use std::iter::IntoIterator;
+
 use ra_syntax::SmolStr;
 use rustc_hash::FxHashSet;
 
@@ -44,6 +46,14 @@ impl CfgOptions {
         self
     }
 
+    /// Shortcut to set features
+    pub fn features(mut self, iter: impl IntoIterator<Item = SmolStr>) -> CfgOptions {
+        for feat in iter {
+            self = self.key_value("feature".into(), feat);
+        }
+        self
+    }
+
     pub fn remove_atom(mut self, name: &SmolStr) -> CfgOptions {
         self.atoms.remove(name);
         self