Point at last valid token on failed expect_one_of

```rust
error: expected one of `.`, `;`, `?`, `}`, or an operator, found `)`
  --> $DIR/token-error-correct-3.rs:29:9
   |
25 |         foo()
   |             - expected one of `.`, `;`, `?`, `}`, or an operator after this
...
29 |     } else {
   |     ^ unexpected token
```

Author: estebank

src/libsyntax/parse/parser.rs

@@ -548,20 +548,20 @@ impl<'a> Parser<'a> {
             expected.dedup();
             let expect = tokens_to_string(&expected[..]);
             let actual = self.this_token_to_string();
-            Err(self.fatal(
-                &(if expected.len() > 1 {
-                    (format!("expected one of {}, found `{}`",
-                             expect,
-                             actual))
-                } else if expected.is_empty() {
-                    (format!("unexpected token: `{}`",
-                             actual))
-                } else {
-                    (format!("expected {}, found `{}`",
-                             expect,
-                             actual))
-                })[..]
-            ))
+            let (msg_exp, label_exp) = if expected.len() > 1 {
+                (format!("expected one of {}, found `{}`", expect, actual),
+                 format!("expected one of {} after this", expect))
+            } else if expected.is_empty() {
+                (format!("unexpected token: `{}`", actual),
+                 "unexpected token after this".to_string())
+            } else {
+                (format!("expected {}, found `{}`", expect, actual),
+                 format!("expected {} after this", expect))
+            };
+            let mut err = self.fatal(&msg_exp);
+            err.span_label(self.prev_span, &label_exp);
+            err.span_label(self.span, &"unexpected token");
+            Err(err)
         }
     }
 

src/test/compile-fail/issue-10636-2.rs

@@ -14,5 +14,7 @@
 pub fn trace_option(option: Option<isize>) {
     option.map(|some| 42; //~ NOTE: unclosed delimiter
                           //~^ ERROR: expected one of
+                          //~| NOTE: expected one of
+                          //~| NOTE: unexpected token
 } //~ ERROR: incorrect close delimiter
 //~^ ERROR: expected expression, found `)`

src/test/compile-fail/macro-incomplete-parse.rs

@@ -20,6 +20,8 @@ macro_rules! ignored_item {
 
 macro_rules! ignored_expr {
     () => ( 1,  //~ ERROR expected one of `.`, `;`, `?`, `}`, or an operator, found `,`
+                //~^ NOTE expected one of `.`, `;`, `?`, `}`, or an operator after this
+                //~| NOTE unexpected token
             2 )
 }
 

src/test/parse-fail/bounds-obj-parens.rs

@@ -12,4 +12,6 @@
 
 type A = Box<(Fn(D::Error) -> E) + 'static + Send + Sync>; // OK (but see #39318)
 
-FAIL //~ ERROR
+FAIL
+//~^ ERROR
+//~| ERROR

src/test/parse-fail/match-refactor-to-expr.rs

@@ -14,7 +14,9 @@ fn main() {
     let foo =
         match //~ NOTE did you mean to remove this `match` keyword?
         Some(4).unwrap_or_else(5)
-        ; //~ ERROR expected one of `.`, `?`, `{`, or an operator, found `;`
+        //~^ NOTE expected one of `.`, `?`, `{`, or an operator after this
+        ; //~ NOTE unexpected token
+        //~^ ERROR expected one of `.`, `?`, `{`, or an operator, found `;`
 
     println!("{}", foo)
 }

src/test/parse-fail/trailing-plus-in-bounds.rs

@@ -16,4 +16,6 @@ fn main() {
     let x: Box<Debug+> = box 3 as Box<Debug+>; // Trailing `+` is OK
 }
 
-FAIL //~ ERROR
+FAIL
+//~^ ERROR
+//~| ERROR

src/test/ui/resolve/token-error-correct-3.stderr

@@ -14,13 +14,18 @@ error: expected one of `,`, `.`, `?`, or an operator, found `;`
   --> $DIR/token-error-correct-3.rs:23:35
    |
 23 |             callback(path.as_ref();  //~ NOTE: unclosed delimiter
-   |                                   ^
+   |                                  -^ unexpected token
+   |                                  |
+   |                                  expected one of `,`, `.`, `?`, or an operator after this
 
 error: expected one of `.`, `;`, `?`, `}`, or an operator, found `)`
   --> $DIR/token-error-correct-3.rs:29:9
    |
+25 |             fs::create_dir_all(path.as_ref()).map(|()| true) //~ ERROR: mismatched types
+   |                                                            - expected one of `.`, `;`, `?`, `}`, or an operator after this
+...
 29 |         } else { //~ ERROR: incorrect close delimiter: `}`
-   |         ^
+   |         ^ unexpected token
 
 error[E0425]: cannot find function `is_directory` in this scope
   --> $DIR/token-error-correct-3.rs:21:13

src/test/ui/resolve/token-error-correct.stderr

@@ -32,7 +32,9 @@ error: expected one of `)`, `,`, `.`, `<`, `?`, `break`, `continue`, `false`, `f
   --> $DIR/token-error-correct.rs:14:13
    |
 14 |     foo(bar(;
-   |             ^
+   |            -^ unexpected token
+   |            |
+   |            expected one of `)`, `,`, `.`, `<`, `?`, `break`, `continue`, `false`, `for`, `if`, `loop`, `match`, `move`, `return`, `true`, `unsafe`, `while`, or an operator after this
 
 error: expected expression, found `)`
   --> $DIR/token-error-correct.rs:23:1