Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3619
Related test failure on travis:
```
[ERROR] Failed to execute goal
org.apache.maven.plugins:maven-compiler-plugin:3.1:testCompile
(default-testCompile) on project flink-core: Compilation failure: Compilation
failure:
[ERROR]
/home/travis/build/apache/flink/flink-core/src/test/java/org/apache/flink/api/java/typeutils/EnumTypeInfoTest.java:[31,41]
incompatible types: cannot infer type arguments for
org.apache.flink.api.java.typeutils.EnumTypeInfo<>
[ERROR] reason: inference variable T has incompatible bounds
[ERROR] equality constraints:
org.apache.flink.api.java.typeutils.EnumTypeInfoTest.TestEnum
[ERROR] upper bounds: java.lang.Enum<capture#1 of ?>,java.lang.Enum<T>
[ERROR]
/home/travis/build/apache/flink/flink-core/src/test/java/org/apache/flink/api/java/typeutils/EnumTypeInfoTest.java:[32,41]
incompatible types: cannot infer type arguments for
org.apache.flink.api.java.typeutils.EnumTypeInfo<>
[ERROR] reason: inference variable T has incompatible bounds
[ERROR] equality constraints:
org.apache.flink.api.java.typeutils.EnumTypeInfoTest.AlternativeEnum
[ERROR] upper bounds: java.lang.Enum<capture#1 of ?>,java.lang.Enum<T>
[ERROR] -> [Help 1]
```
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