fix: issue #1255 rethrow a failure exception for ok and failure

matcher/shared/src/main/scala/org/specs2/matcher/ThrownExpectations.scala

@@ -38,6 +38,7 @@ trait ThrownExpectables extends ExpectationsCreation {
       // overriding this method is necessary to include the ThrownExpectation trait into the stacktrace of the created match result
       override def applyMatcher[S >: T](m: =>Matcher[S]): MatchResult[S] = super.applyMatcher(m)
       override def check[S >: T](r: MatchResult[S]): MatchResult[S] = checkFailure(r)
+      override def checkResult(r: Result): Result = checkResultFailure(r)
       override val desc = alias
       override def map[S](f: T => S): Expectable[S] = createExpectable(f(value), desc)
       override def mapDescription(d: Option[String => String]): Expectable[T] = createExpectable(value, d)

tests/src/test/scala/org/specs2/matcher/MatchResultCombinatorsSpec.scala

@@ -85,4 +85,11 @@ class MatchResultCombinatorsSpec extends mutable.Spec with ResultMatchers with M
     "there is only one stored expectation (see #320)" ==> { stored must haveSize(1) }
     stored.map(_.message).head must_== "'hello world' doesn't have size 10 but size 11"
   }
+
+  "issue #1255 ok and failure must throw an exception" >> {
+    new MustThrownExpectations {
+      ok and failure
+    } must throwA[execute.FailureException]
+  }
+
 }

version.sbt

@@ -1,2 +1,2 @@
-ThisBuild / version := "4.20.7"
+ThisBuild / version := "4.20.8"
 ThisBuild / versionScheme := Some("semver-spec")