Auto merge of #61361 - estebank:infer-type, r=varkor

Add more detail to type inference error

When encountering code where type inference fails, add more actionable
information:

```
fn main() {
    let foo = Vec::new();
}
```

```
error[E0282]: type annotations needed in `std::vec::Vec<T>`
  --> $DIR/vector-no-ann.rs:2:16
   |
LL |     let foo = Vec::new();
   |         ---   ^^^^^^^^ cannot infer type for `T` in `std::vec::Vec<T>`
   |         |
   |         consider giving `foo` a type
```

Fix #25633.

src/test/ui/issues/issue-12187-1.rs

@@ -4,5 +4,5 @@ fn new<T>() -> &'static T {
 
 fn main() {
     let &v = new();
-    //~^ ERROR type annotations needed [E0282]
+    //~^ ERROR type annotations needed
 }

src/test/ui/issues/issue-12187-1.stderr

@@ -1,11 +1,11 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `&T`
   --> $DIR/issue-12187-1.rs:6:10
    |
 LL |     let &v = new();
    |         -^
    |         ||
    |         |cannot infer type
-   |         consider giving the pattern a type
+   |         consider giving this pattern the explicit type `&T`, with the type parameters specified
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-12187-2.rs

@@ -4,5 +4,5 @@ fn new<'r, T>() -> &'r T {
 
 fn main() {
     let &v = new();
-    //~^ ERROR type annotations needed [E0282]
+    //~^ ERROR type annotations needed
 }

src/test/ui/issues/issue-12187-2.stderr

@@ -1,11 +1,11 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `&T`
   --> $DIR/issue-12187-2.rs:6:10
    |
 LL |     let &v = new();
    |         -^
    |         ||
    |         |cannot infer type
-   |         consider giving the pattern a type
+   |         consider giving this pattern the explicit type `&T`, with the type parameters specified
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-17551.stderr

@@ -1,10 +1,10 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `B<T>`
   --> $DIR/issue-17551.rs:6:15
    |
 LL |     let foo = B(marker::PhantomData);
    |         ---   ^ cannot infer type for `T`
    |         |
-   |         consider giving `foo` a type
+   |         consider giving `foo` the explicit type `B<T>`, where the type parameter `T` is specified
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-20261.stderr

@@ -1,4 +1,4 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `&(_,)`
   --> $DIR/issue-20261.rs:4:11
    |
 LL |     for (ref i,) in [].iter() {

src/test/ui/issues/issue-23046.stderr

@@ -1,8 +1,8 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `Expr<'_, VAR>`
   --> $DIR/issue-23046.rs:17:15
    |
 LL |     let ex = |x| {
-   |               ^ consider giving this closure parameter a type
+   |               ^ consider giving this closure parameter the explicit type `Expr<'_, VAR>`, where the type parameter `VAR` is specified
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-25368.stderr

@@ -1,8 +1,8 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `(std::sync::mpsc::Sender<Foo<T>>, std::sync::mpsc::Receiver<Foo<T>>)`
   --> $DIR/issue-25368.rs:11:17
    |
 LL |     let (tx, rx) = channel();
-   |         -------- consider giving the pattern a type
+   |         -------- consider giving this pattern the explicit type `(std::sync::mpsc::Sender<Foo<T>>, std::sync::mpsc::Receiver<Foo<T>>)`, where the type parameter `T` is specified
 ...
 LL |         tx.send(Foo{ foo: PhantomData });
    |                 ^^^ cannot infer type for `T`

src/test/ui/issues/issue-7813.stderr

@@ -1,10 +1,10 @@
-error[E0282]: type annotations needed
+error[E0282]: type annotations needed for `&[_; 0]`
   --> $DIR/issue-7813.rs:2:13
    |
 LL |     let v = &[];
    |         -   ^^^ cannot infer type
    |         |
-   |         consider giving `v` a type
+   |         consider giving `v` the explicit type `&[_; 0]`, with the type parameters specified
 
 error: aborting due to previous error