Feature gate try_from

This was discovered #5 (comment)
PyO3 · May 5, 2018 · afcc87e · afcc87e
1 parent 0b511e8
commit afcc87e
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diff --git a/src/lib.rs b/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(specialization, proc_macro, try_from, fn_must_use)]
+#![feature(specialization, proc_macro)]
 
 //! Rust bindings to the Python interpreter.
 //!

diff --git a/src/objects/mod.rs b/src/objects/mod.rs
@@ -180,6 +180,7 @@ macro_rules! pyobject_extract(
             }
         }
 
+        #[cfg(feature = "try_from")]
         impl<'source> $crate::std::convert::TryFrom<&'source $crate::PyObjectRef> for $t
         {
             type Error = $crate::PyErr;