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/CompletionProposalComputerDescriptor.java
private static final String DEFAULT_CATEGORY_ID= "org.eclipse.jdt.ui.defaultProposalCategory"; 
	
	private static final String CATEGORY_ID= "categoryId"; 
	
	private static final String TYPE= "type"; 
	
	private static final String CLASS= "class"; 
	
	private static final String ACTIVATE= "activate"; 
	
	private static final String PARTITION= "partition"; 
	
	private static final Set PARTITION_SET;
	
	private static final String PERFORMANCE_EVENT= JavaPlugin.getPluginId() + "/perf/content_assist/extensions"; 
	/**
	 * If <code>true</code>, execution time of extensions is measured and extensions may be
	 * disabled if execution takes too long.
	 */