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
String message= format.format(args);
		return message;
	}
	
	private String getCategoryLabel(int repetition) {
		int iteration= repetition % fCategoryIteration.size();
		if (iteration == 0)
			return JavaTextMessages.ContentAssistProcessor_defaultProposalCategory;
		return toString((CompletionProposalCategory) ((List) fCategoryIteration.get(iteration)).get(0));
	}
	
	private String toString(CompletionProposalCategory category) {
		return category.getName().replaceAll("&", ""); 
	}
	private String getIterationGesture() {
		final IBindingService bindingSvc= (IBindingService) PlatformUI.getWorkbench().getAdapter(IBindingService.class);
		TriggerSequence[] triggers= bindingSvc.getActiveBindingsFor(getContentAssistCommand());
		return triggers.length > 0 ? 
				  MessageFormat.format(JavaTextMessages.ContentAssistProcessor_toggle_affordance_press_gesture, new Object[] { triggers[0].format() })
				: JavaTextMessages.ContentAssistProcessor_toggle_affordance_click_gesture;
	}
	private ParameterizedCommand getContentAssistCommand() {
		final ICommandService commandSvc= (ICommandService) PlatformUI.getWorkbench().getAdapter(ICommandService.class);
		final Command command= commandSvc.getCommand(ITextEditorActionDefinitionIds.CONTENT_ASSIST_PROPOSALS);
		ParameterizedCommand pCmd= new ParameterizedCommand(command, null);
		return pCmd;
	}
	
}