  default_impl! { u32, 0, "Returns the default value of `0`" }
  default_impl! { u64, 0, "Returns the default value of `0`" }
 -default_impl! { u128, 0, "Returns the default value of `0`" }
- 
+
  default_impl! { isize, 0, "Returns the default value of `0`" }
  default_impl! { i8, 0, "Returns the default value of `0`" }
  default_impl! { i16, 0, "Returns the default value of `0`" }
  default_impl! { i32, 0, "Returns the default value of `0`" }
  default_impl! { i64, 0, "Returns the default value of `0`" }
 -default_impl! { i128, 0, "Returns the default value of `0`" }
- 
+
  default_impl! { f32, 0.0f32, "Returns the default value of `0.0`" }
  default_impl! { f64, 0.0f64, "Returns the default value of `0.0`" }
 diff --git a/src/libcore/fmt/num.rs b/src/libcore/fmt/num.rs

 test_impl_from! { test_booli32, bool, i32 }
 test_impl_from! { test_booli64, bool, i64 }
-test_impl_from! { test_booli128, bool, i128 }
 
 // Signed -> Float
 test_impl_from! { test_i8f32, i8, f32 }
@@ -265,51 +263,35 @@ test_impl_try_from_always_ok! { test_try_u8u8, u8, u8 }

 test_impl_try_from_always_ok! { test_try_u16i32, u16, i32 }
 test_impl_try_from_always_ok! { test_try_u16i64, u16, i64 }
-test_impl_try_from_always_ok! { test_try_u16i128, u16, i128 }

 test_impl_try_from_always_ok! { test_try_u32u32, u32, u32 }
 test_impl_try_from_always_ok! { test_try_u32u64, u32, u64 }
-test_impl_try_from_always_ok! { test_try_u32u128, u32, u128 }
 test_impl_try_from_always_ok! { test_try_u32i64, u32, i64 }
-test_impl_try_from_always_ok! { test_try_u32i128, u32, i128 }

 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_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 }
 test_impl_try_from_always_ok! { test_try_i8i32, i8, i32 }
 test_impl_try_from_always_ok! { test_try_i8i64, i8, i64 }
-test_impl_try_from_always_ok! { test_try_i8i128, i8, i128 }

 test_impl_try_from_always_ok! { test_try_i16i16, i16, i16 }
 test_impl_try_from_always_ok! { test_try_i16i32, i16, i32 }
 test_impl_try_from_always_ok! { test_try_i16i64, i16, i64 }
-test_impl_try_from_always_ok! { test_try_i16i128, i16, i128 }

 test_impl_try_from_always_ok! { test_try_i32i32, i32, i32 }
 test_impl_try_from_always_ok! { test_try_i32i64, i32, i64 }
-test_impl_try_from_always_ok! { test_try_i32i128, i32, i128 }

 test_impl_try_from_always_ok! { test_try_i64i64, i64, i64 }
-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 }
diff --git a/src/libcore/time.rs b/src/libcore/time.rs
