Fix error index E0370 doctests on 32 bit platforms

Author: ollie27

src/librustc_typeck/diagnostics.rs

@@ -2865,8 +2865,8 @@ E0370: r##"
 The maximum value of an enum was reached, so it cannot be automatically
 set in the next enum value. Erroneous code example:
 
-```compile_fail
-#[deny(overflowing_literals)]
+```compile_fail,E0370
+#[repr(i64)]
 enum Foo {
     X = 0x7fffffffffffffff,
     Y, // error: enum discriminant overflowed on value after
@@ -2879,6 +2879,7 @@ To fix this, please set manually the next enum value or put the enum variant
 with the maximum value at the end of the enum. Examples:
 
 ```
+#[repr(i64)]
 enum Foo {
     X = 0x7fffffffffffffff,
     Y = 0, // ok!
@@ -2888,6 +2889,7 @@ enum Foo {
 Or:
 
 ```
+#[repr(i64)]
 enum Foo {
     Y = 0, // ok!
     X = 0x7fffffffffffffff,