Update E0107 message to new format

Author: ojsheikh

src/librustc_typeck/astconv.rs

@@ -2266,9 +2266,25 @@ fn check_type_argument_count(tcx: TyCtxt, span: Span, supplied: usize,
 }
 
 fn report_lifetime_number_error(tcx: TyCtxt, span: Span, number: usize, expected: usize) {
-    span_err!(tcx.sess, span, E0107,
-              "wrong number of lifetime parameters: expected {}, found {}",
-              expected, number);
+    let label = if number < expected {
+        if expected == 1 {
+            format!("expected {} lifetime parameter", expected)
+        } else {
+            format!("expected {} lifetime parameters", expected)
+        }
+    } else {
+        let additional = number - expected;
+        if additional == 1 {
+            "unexpected lifetime parameter".to_string()
+        } else {
+            format!("{} unexpected lifetime parameters", additional)
+        }
+    };
+    struct_span_err!(tcx.sess, span, E0107,
+                     "wrong number of lifetime parameters: expected {}, found {}",
+                     expected, number)
+        .span_label(span, &label)
+        .emit();
 }
 
 // A helper struct for conveniently grouping a set of bounds which we pass to

src/test/compile-fail/E0107.rs

@@ -17,8 +17,12 @@ enum Bar {
 }
 
 struct Baz<'a> {
-    foo: Foo, //~ ERROR E0107
-    bar: Bar<'a>, //~ ERROR E0107
+    foo: Foo,
+    //~^ ERROR E0107
+    //~| expected 1 lifetime parameter
+    bar: Bar<'a>,
+    //~^ ERROR E0107
+    //~| unexpected lifetime parameter
 }
 
 fn main() {