error-prone

UnnecessarilyFullyQualified: check that position information is available before creating the inner List.

CompileTimeConstantExpressionMatcherTest: fix brittle test, which currently does not complain if it does not find the expected values because of a typo. If none of the keys are found, the test succeeds trivially.

Fix findIdent incompatibility with Java 13

EqualsGetClass: call out violating symmetry as a problem in the summary, rather than burying it in the details.

Add a check to suggest importing unnecessarily qualified names.