dev-java/ant-tasks was a meta ebuild that is no longer used in 1.7.1 so it's going away completely
# Vlastimil Babka <cas...@gentoo.org> (30 Apr 2009) # masked for removal, bug #261563 =dev-java/ant-core-1.7.0* =dev-java/ant-antlr-1.7.0* =dev-java/ant-apache-bcel-1.7.0* =dev-java/ant-apache-bsf-1.7.0* =dev-java/ant-apache-log4j-1.7.0* =dev-java/ant-apache-oro-1.7.0* =dev-java/ant-apache-regexp-1.7.0* =dev-java/ant-apache-resolver-1.7.0* =dev-java/ant-commons-logging-1.7.0* =dev-java/ant-commons-net-1.7.0* =dev-java/ant-jai-1.7.0* =dev-java/ant-javamail-1.7.0* =dev-java/ant-jdepend-1.7.0* =dev-java/ant-jmf-1.7.0* =dev-java/ant-jsch-1.7.0* =dev-java/ant-junit-1.7.0* =dev-java/ant-junit4-1.7.0* =dev-java/ant-nodeps-1.7.0* =dev-java/ant-swing-1.7.0* =dev-java/ant-trax-1.7.0* dev-java/ant-tasks =dev-java/ant-1.7.0*
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