I upgraded my OS Ant version to 1.8.1 (I use Gentoo Linux if that's important). Previously I was using the OS's install of Ant 1.7.1 from within Eclipse Helios by changing the Ant Runtime to point to my Ant installation. However after upgrading to Ant 1.8.1 I'm getting errors/warnings in the Ant editor when using 1.8 features.
For example if I try to import from a JAR via the tag Eclipse gives me a warning saying that doesn't support the tag. However the build file runs with no errors (using macrodefs from the imported file) from both within Eclipse and on the command line.
Therefore I know that Ant is working properly, but I don't know why the Ant Editor is reporting problems.