Small fixes.

Fix typo in test, add @SInCE markers to new constructors.

Change-Id: I31abbf41049a3d5820d82165ab16ce8357c79132
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/108722
Reviewed-by: Erik Ernst <[email protected]>
Commit-Queue: Lasse R.H. Nielsen <[email protected]>

Author: lrhn

sdk/lib/async/stream.dart

@@ -118,6 +118,7 @@ abstract class Stream<T> {
    * The returned stream is effectively equivalent to one created by
    * `(() async* { yield value; } ())` or `Future<T>.value(value).asStream()`.
    */
+  @Since("2.5")
   factory Stream.value(T value) =>
       (_AsyncStreamController<T>(null, null, null, null)
             .._add(value)
@@ -148,6 +149,7 @@ abstract class Stream<T> {
    * `(() async* { throw error; } ())`, except that you can control the
    * stack trace as well.
    */
+  @Since("2.5")
   factory Stream.error(Object error, [StackTrace stackTrace]) =>
       (_AsyncStreamController<T>(null, null, null, null)
             .._addError(error, stackTrace)

tests/corelib_2/type_tostring_test.dart

@@ -14,7 +14,7 @@ import "package:expect/expect.dart";
 
 void expectType(Type type, Pattern text) {
   var typeString = "$type";
-  if (typeString.contains("minimized:")) {
+  if (typeString.contains("minified:")) {
     return; // No checks for minimized types.
   }
   if (text is String) {