Add test that capture-checks the compiler

Author: odersky

compiler/test/dotty/tools/dotc/BootstrappedOnlyCompilationTests.scala

@@ -38,7 +38,7 @@ class BootstrappedOnlyCompilationTests {
   @Test def posWithCompilerCC: Unit =
     implicit val testGroup: TestGroup = TestGroup("compilePosWithCompilerCC")
     aggregateTests(
-      compileDir("tests/pos-with-compiler-cc/dotc", withCompilerOptions)
+      compileDir("tests/pos-with-compiler-cc/dotc", withCompilerOptions.and("-language:experimental.captureChecking"))
     ).checkCompile()
 
   @Test def posWithCompiler: Unit = {