3 files changed, 9 insertions, 1 deletions
diff --git a/src/libstd/error.rs b/src/libstd/error.rs
index 35cd4a5ec52..d49d9764946 100644
--- a/src/libstd/error.rs
+++ b/src/libstd/error.rs
@@ -159,6 +159,13 @@ impl Error for num::ParseIntError {
     }
 }
 
+#[unstable(feature = "try_from", issue = "33417")]
+impl Error for num::TryFromIntError {
+    fn description(&self) -> &str {
+        self.__description()
+    }
+}
+
 #[stable(feature = "rust1", since = "1.0.0")]
 impl Error for num::ParseFloatError {
     fn description(&self) -> &str {
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index e14a31453d3..d4b40b844fc 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -270,6 +270,7 @@
 #![feature(vec_push_all)]
 #![feature(zero_one)]
 #![feature(question_mark)]
+#![feature(try_from)]
 
 // Issue# 30592: Systematically use alloc_system during stage0 since jemalloc
 // might be unavailable or disabled
diff --git a/src/libstd/num/mod.rs b/src/libstd/num/mod.rs
index 1886b4fdf59..d33df05acf2 100644
--- a/src/libstd/num/mod.rs
+++ b/src/libstd/num/mod.rs
@@ -19,7 +19,7 @@
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::num::{Zero, One};
 #[stable(feature = "rust1", since = "1.0.0")]
-pub use core::num::{FpCategory, ParseIntError, ParseFloatError};
+pub use core::num::{FpCategory, ParseIntError, ParseFloatError, TryFromIntError};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::num::Wrapping;