update various test cases that generate slightly different output

For the most part, it seems to be better, but one side-effect is that I
cannot seem to reproduce E0102 anymore.

src/librustc_typeck/diagnostics.rs

@@ -1378,7 +1378,7 @@ E0102: r##"
 You hit this error because the compiler lacks the information to
 determine the type of this variable. Erroneous code example:
 
-```compile_fail,E0102
+```compile_fail,E0282
 // could be an array of anything
 let x = []; // error: cannot determine a type for this local variable
 ```

src/test/compile-fail/E0102.rs

@@ -10,6 +10,7 @@
 
 fn main() {
     let x = [];
-    //~^ ERROR E0102
-    //~| NOTE cannot resolve type of variable
+    //~^ ERROR type annotations needed
+    //~| NOTE consider giving `x` a type
+    //~| NOTE cannot infer type for `_`
 }

src/test/compile-fail/destructure-trait-ref.rs

@@ -35,7 +35,7 @@ fn main() {
     // n == m
     let &x = &1isize as &T;      //~ ERROR type `&T` cannot be dereferenced
     let &&x = &(&1isize as &T);  //~ ERROR type `&T` cannot be dereferenced
-    let box x = box 1isize as Box<T>; //~ ERROR `T: std::marker::Sized` is not satisfied
+    let box x = box 1isize as Box<T>; //~ ERROR type `std::boxed::Box<T>` cannot be dereferenced
 
     // n > m
     let &&x = &1isize as &T;

src/test/compile-fail/issue-12187-1.rs

@@ -16,4 +16,5 @@ fn main() {
     let &v = new();
     //~^ ERROR type annotations needed [E0282]
     //~| NOTE cannot infer type for `_`
+    //~| NOTE consider giving a type to pattern
 }

src/test/compile-fail/issue-12187-2.rs

@@ -16,4 +16,5 @@ fn main() {
     let &v = new();
     //~^ ERROR type annotations needed [E0282]
     //~| NOTE cannot infer type for `_`
+    //~| NOTE consider giving a type to pattern
 }

src/test/compile-fail/issue-7813.rs

@@ -9,7 +9,8 @@
 // except according to those terms.
 
 fn main() {
-    let v = &[]; //~ NOTE consider giving `v` a type
-    let it = v.iter(); //~ ERROR type annotations needed
-    //~^ NOTE cannot infer type for `_`
+    let v = &[]; //~ ERROR type annotations needed
+    //~| NOTE consider giving `v` a type
+    //~| NOTE cannot infer type for `_`
+    let it = v.iter();
 }