diff --git a/src/libcore/num/mod.rs b/src/libcore/num/mod.rs
index 0ebac027c39ac..c6c91dacdc7ee 100644
--- a/src/libcore/num/mod.rs
+++ b/src/libcore/num/mod.rs
@@ -2627,8 +2627,11 @@ try_from_both_bounded!(i32, u16, u8);
 try_from_both_bounded!(i64, u32, u16, u8);
 try_from_both_bounded!(i128, u64, u32, u16, u8);
 
-#[unstable(feature = "try_from", issue = "33417")]
-pub use self::ptr_try_from_impls::*;
+// usize/isize
+try_from_unbounded!(usize, usize);
+try_from_upper_bounded!(usize, isize);
+try_from_lower_bounded!(isize, usize);
+try_from_unbounded!(isize, isize);
 
 #[cfg(target_pointer_width = "16")]
 mod ptr_try_from_impls {
@@ -2636,12 +2639,12 @@ mod ptr_try_from_impls {
     use convert::TryFrom;
 
     try_from_upper_bounded!(usize, u8);
-    try_from_unbounded!(usize, usize, u16, u32, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16, isize);
+    try_from_unbounded!(usize, u16, u32, u64, u128);
+    try_from_upper_bounded!(usize, i8, i16);
     try_from_unbounded!(usize, i32, i64, i128);
 
     try_from_both_bounded!(isize, u8);
-    try_from_lower_bounded!(isize, usize, u16, u32, u64, u128);
+    try_from_lower_bounded!(isize, u16, u32, u64, u128);
     try_from_both_bounded!(isize, i8);
     try_from_unbounded!(isize, i16, i32, i64, i128);
 
@@ -2662,12 +2665,12 @@ mod ptr_try_from_impls {
     use convert::TryFrom;
 
     try_from_upper_bounded!(usize, u8, u16);
-    try_from_unbounded!(usize, usize, u32, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16, i32, isize);
+    try_from_unbounded!(usize, u32, u64, u128);
+    try_from_upper_bounded!(usize, i8, i16, i32);
     try_from_unbounded!(usize, i64, i128);
 
     try_from_both_bounded!(isize, u8, u16);
-    try_from_lower_bounded!(isize, usize, u32, u64, u128);
+    try_from_lower_bounded!(isize, u32, u64, u128);
     try_from_both_bounded!(isize, i8, i16);
     try_from_unbounded!(isize, i32, i64, i128);
 
@@ -2688,12 +2691,12 @@ mod ptr_try_from_impls {
     use convert::TryFrom;
 
     try_from_upper_bounded!(usize, u8, u16, u32);
-    try_from_unbounded!(usize, usize, u64, u128);
-    try_from_upper_bounded!(usize, i8, i16, i32, i64, isize);
+    try_from_unbounded!(usize, u64, u128);
+    try_from_upper_bounded!(usize, i8, i16, i32, i64);
     try_from_unbounded!(usize, i128);
 
     try_from_both_bounded!(isize, u8, u16, u32);
-    try_from_lower_bounded!(isize, usize, u64, u128);
+    try_from_lower_bounded!(isize, u64, u128);
     try_from_both_bounded!(isize, i8, i16, i32);
     try_from_unbounded!(isize, i64, i128);
 
diff --git a/src/libcore/tests/num/mod.rs b/src/libcore/tests/num/mod.rs
index 3e872b34e433d..046b81e19f70d 100644
--- a/src/libcore/tests/num/mod.rs
+++ b/src/libcore/tests/num/mod.rs
@@ -279,7 +279,7 @@ test_impl_try_from_always_ok! { test_try_u64u64, u64, u64 }
 test_impl_try_from_always_ok! { test_try_u64u128, u64, u128 }
 test_impl_try_from_always_ok! { test_try_u64i128, u64, i128 }
 
-test_impl_try_from_always_ok! { test_try_u128, u128, u128 }
+test_impl_try_from_always_ok! { test_try_u128u128, u128, u128 }
 
 test_impl_try_from_always_ok! { test_try_i8i8, i8, i8 }
 test_impl_try_from_always_ok! { test_try_i8i16, i8, i16 }
@@ -301,8 +301,12 @@ test_impl_try_from_always_ok! { test_try_i64i128, i64, i128 }
 
 test_impl_try_from_always_ok! { test_try_i128i128, i128, i128 }
 
+test_impl_try_from_always_ok! { test_try_usizeusize, usize, usize }
+test_impl_try_from_always_ok! { test_try_isizeisize, isize, isize }
+
 assume_usize_width! {
     test_impl_try_from_always_ok! { test_try_u8usize, u8, usize }
+    test_impl_try_from_always_ok! { test_try_u8isize, u8, isize }
     test_impl_try_from_always_ok! { test_try_i8isize, i8, isize }
 
     test_impl_try_from_always_ok! { test_try_u16usize, u16, usize }
@@ -317,19 +321,27 @@ assume_usize_width! {
 
     cfg_block!(
         #[cfg(target_pointer_width = "16")] {
-            test_impl_try_from_always_ok! { test_try_u16usize, u16, usize }
-            test_impl_try_from_always_ok! { test_try_i16isize, i16, isize }
+            test_impl_try_from_always_ok! { test_try_usizeu16, usize, u16 }
+            test_impl_try_from_always_ok! { test_try_isizei16, isize, i16 }
+            test_impl_try_from_always_ok! { test_try_usizeu32, usize, u32 }
+            test_impl_try_from_always_ok! { test_try_usizei32, usize, i32 }
+            test_impl_try_from_always_ok! { test_try_isizei32, isize, i32 }
+            test_impl_try_from_always_ok! { test_try_usizei64, usize, i64 }
         }
 
         #[cfg(target_pointer_width = "32")] {
+            test_impl_try_from_always_ok! { test_try_u16isize, u16, isize }
             test_impl_try_from_always_ok! { test_try_usizeu32, usize, u32 }
             test_impl_try_from_always_ok! { test_try_isizei32, isize, i32 }
             test_impl_try_from_always_ok! { test_try_u32usize, u32, usize }
             test_impl_try_from_always_ok! { test_try_i32isize, i32, isize }
+            test_impl_try_from_always_ok! { test_try_usizei64, usize, i64 }
         }
 
         #[cfg(target_pointer_width = "64")] {
+            test_impl_try_from_always_ok! { test_try_u16isize, u16, isize }
             test_impl_try_from_always_ok! { test_try_u32usize, u32, usize }
+            test_impl_try_from_always_ok! { test_try_u32isize, u32, isize }
             test_impl_try_from_always_ok! { test_try_i32isize, i32, isize }
             test_impl_try_from_always_ok! { test_try_u64usize, u64, usize }
             test_impl_try_from_always_ok! { test_try_i64isize, i64, isize }
@@ -451,8 +463,8 @@ assume_usize_width! {
 
     cfg_block!(
         #[cfg(target_pointer_width = "16")] {
+            test_impl_try_from_unsigned_to_signed_upper_err! { test_try_u16isize, u16, isize }
             test_impl_try_from_unsigned_to_signed_upper_err! { test_try_u32isize, u32, isize }
-            test_impl_try_from_unsigned_to_signed_upper_err! { test_try_u32isize, u64, isize }
         }
 
         #[cfg(target_pointer_width = "32")] {