Various regression tests in javac depend on the particular output of toString for annotations, in particular using [] rather than {} for annotations.

With improvements to the output (JDK-8162817) these tests

tools/javac/annotations/repeatingAnnotations/combo/ReflectionTest.java
tools/javac/processing/model/element/repeatingAnnotations/MixRepeatableAndOfficialContainerBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/MixRepeatableAndOfficialContainerInheritedA1Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixRepeatableAndOfficialContainerInheritedA2Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixRepeatableAndOfficialContainerInheritedB1Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixRepeatableAndOfficialContainerInheritedB2Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixSingularAndUnofficialContainerBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/MixSingularAndUnofficialContainerInheritedA1Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixSingularAndUnofficialContainerInheritedA2Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixSingularAndUnofficialContainerInheritedB1Test.java
tools/javac/processing/model/element/repeatingAnnotations/MixSingularAndUnofficialContainerInheritedB2Test.java
tools/javac/processing/model/element/repeatingAnnotations/OfficialContainerBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/OfficialContainerInheritedTest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableInheritedTest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableOfficialContainerBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableOfficialContainerInheritedTest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableOverrideATest.java
tools/javac/processing/model/element/repeatingAnnotations/RepeatableOverrideBTest.java
tools/javac/processing/model/element/repeatingAnnotations/UnofficialContainerBasicTest.java
tools/javac/processing/model/element/repeatingAnnotations/UnofficialContainerInheritedTest.java

now fail and need to be updated.