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This was brought up on the users list, see http://forums.netbeans.org/topic16102.html. It reproducible if you try to rename the method from the call node, renaming from method def node works though.
Fixed in 8827c8f8fcca.
Integrated into 'main-golden', will be available in build *200909010201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-golden/rev/8827c8f8fcca User: Erno Mononen <emononen@netbeans.org> Log: #171160: Rename method is failing