tree 290994489b15e015fb06b3a33ff3faa52779b827
parent bb79f0f254c26b328fb0aafaab5a05c93d7b3a12
author Václav Kubernát <kubervac@fit.cvut.cz> 1533556563 +0200
committer Václav Kubernát <kubervac@fit.cvut.cz> 1533556831 +0200

Change return value of listKeys

Not every subclass stores keys in a set, so returning a reference might
not always be possible.

Change-Id: If19f81d9ee9ddb5e2ce0133af1a39115f62676a3