Auto merge of #1458 - RalfJung:rustup, r=RalfJung

bump Rust

rust-version

@@ -1 +1 @@
-67100f61e62a86f2bf9e38552ee138e231eddc74
+7750c3d46bc19784adb1ee6e37a5ec7e4cd7e772

tests/compile-fail/intrinsics/exact_div2.rs

@@ -1,5 +1,5 @@
 #![feature(core_intrinsics)]
 fn main() {
     // divison with a remainder
-    unsafe { std::intrinsics::exact_div(2u16, 3); } //~ ERROR 2u16 cannot be divided by 3u16 without remainder
+    unsafe { std::intrinsics::exact_div(2u16, 3); } //~ ERROR 2_u16 cannot be divided by 3_u16 without remainder
 }

tests/compile-fail/intrinsics/exact_div3.rs

@@ -1,5 +1,5 @@
 #![feature(core_intrinsics)]
 fn main() {
     // signed divison with a remainder
-    unsafe { std::intrinsics::exact_div(-19i8, 2); } //~ ERROR -19i8 cannot be divided by 2i8 without remainder
+    unsafe { std::intrinsics::exact_div(-19i8, 2); } //~ ERROR -19_i8 cannot be divided by 2_i8 without remainder
 }