Add FromStr impl for NonZero types

1 files changed, 17 insertions, 0 deletions

diff --git a/src/libcore/tests/nonzero.rs b/src/libcore/tests/nonzero.rs
index 4532568ee0c..6e2d4588edc 100644
--- a/src/libcore/tests/nonzero.rs
+++ b/src/libcore/tests/nonzero.rs
@@ -126,3 +126,20 @@ fn test_from_signed_nonzero() {
     let num: i32 = nz.into();
     assert_eq!(num, 1i32);
 }
+
+#[test]
+fn test_from_str() {
+    assert_eq!(FromStr::from_str("123"), Ok(NonZeroU8::new(123).unwrap()));
+    assert_eq!(
+        FromStr::from_str("0"),
+        Err(ParseNonZeroIntError {
+            kind: NonZeroIntErrorKind::Zero
+        })
+    );
+    assert_eq!(
+        FromStr::from_str("-1", 
+        Err(ParseNonZeroIntError {
+            kind: NonZeroIntErrorKind::Underflow
+        })
+    );
+}