Spotted by installation tests, while trying to install everything from Central:

ontains: Your original request has been modified.
Contains: "Mylyn Context Connector: Eclipse IDE" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Mylyn Commons" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Mylyn Context Connector: Java Development" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "JBoss Tools Common - Mylyn" is already installed, so an update will be performed instead.
Contains: "Mylyn Task-Focused Interface" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Mylyn Task List" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Mylyn Context Connector: Team Support" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Google Plugin for Eclipse 4.2" is already present because other installed software requires it. It will be added to the installed software list.
Contains: "Mylyn Tasks Connector: Bugzilla" is already present because other installed software requires it. It will be added to the installed software list.
Contains: Cannot complete the install because of a conflicting dependency.
Contains: Software being installed: JBoss Tools Common - Mylyn 3.4.0.Beta2-v20121114-2253-B23 (org.jboss.tools.common.mylyn.feature.feature.group 3.4.0.Beta2-v20121114-2253-B23)
Contains: Software currently installed: org.jboss.tools.common.mylyn.feature.source.feature.group 3.4.0.Alpha1-v20121123-2241-B69
Contains: Only one of the following can be installed at once:
Contains: JBoss Tools Common - Mylyn 3.4.0.Beta2-v20121114-2253-B23 (org.jboss.tools.common.mylyn.feature.feature.jar 3.4.0.Beta2-v20121114-2253-B23)
Contains: JBoss Tools Common - Mylyn 3.4.0.Alpha1-v20121123-2241-B69 (org.jboss.tools.common.mylyn.feature.feature.jar 3.4.0.Alpha1-v20121123-2241-B69)
Contains: Cannot satisfy dependency:
Contains: From: JBoss Tools Common - Mylyn 3.4.0.Alpha1-v20121123-2241-B69 (org.jboss.tools.common.mylyn.feature.feature.group 3.4.0.Alpha1-v20121123-2241-B69)
Contains: To: org.jboss.tools.common.mylyn.feature.feature.jar [3.4.0.Alpha1-v20121123-2241-B69]
Contains: Cannot satisfy dependency:
Contains: From: JBoss Tools Common - Mylyn 3.4.0.Beta2-v20121114-2253-B23 (org.jboss.tools.common.mylyn.feature.feature.group 3.4.0.Beta2-v20121114-2253-B23)
Contains: To: org.jboss.tools.common.mylyn.feature.feature.jar [3.4.0.Beta2-v20121114-2253-B23]
Contains: Cannot satisfy dependency:
Contains: From: org.jboss.tools.common.mylyn.feature.source.feature.group 3.4.0.Alpha1-v20121123-2241-B69
Contains: To: org.jboss.tools.common.mylyn.feature.feature.group [3.4.0.Alpha1-v20121123-2241-B69]