Bug 117493 [content assist] CompletionRequestor#completionFailure(IProblem)) is ignored
This got introduced after 3.2 M1 (i.e. broken in 3.2 M2 and newer). If completion fails we now always show: "No completion available." instead of the real error text. Example: for (Iterator i=things.iterator(); i.<ctrl-space> // Iterator not yet imported)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/java/ContentAssistProcessor.java
/*
			 * @see org.eclipse.jface.text.contentassist.ICompletionListener#assistSessionEnded(org.eclipse.jface.text.contentassist.ContentAssistEvent)
			 */
			public void assistSessionEnded(ContentAssistEvent event) {
				if (event.processor != ContentAssistProcessor.this)
					return;
				
				fCategoryIteration= null;
				fRepetition= -1;
				fIterationGesture= null;
				event.assistant.setShowEmptyList(false);
				event.assistant.setCyclingMode(false);
			}
			
		});
	}
	/*
	 * @see org.eclipse.jface.text.contentassist.IContentAssistProcessor#computeCompletionProposals(org.eclipse.jface.text.ITextViewer, int)
	 */
	public final ICompletionProposal[] computeCompletionProposals(ITextViewer viewer, int offset) {
		IProgressMonitor monitor= createProgressMonitor();
		monitor.beginTask(JavaTextMessages.ContentAssistProcessor_computing_proposals, fCategories.size() + 1);
		TextContentAssistInvocationContext context= createContext(viewer, offset);
		
		monitor.subTask(JavaTextMessages.ContentAssistProcessor_collecting_proposals);
		List proposals= collectProposals(viewer, offset, monitor, context);
		monitor.subTask(JavaTextMessages.ContentAssistProcessor_sorting_proposals);
		List filtered= filterAndSortProposals(proposals, monitor, context);
		
		ICompletionProposal[] result= (ICompletionProposal[]) filtered.toArray(new ICompletionProposal[filtered.size()]);