Bug 125467 [clean up][infrastructure] Show hit ctrl-enter message
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/text/correction/AssistContext.java
fCompilationUnit= cu;
		fOffset= offset;
		fLength= length;
		fASTRoot= null;
	}
	/**
	 * Returns the compilation unit.
	 * @return Returns a ICompilationUnit
	 */
	public ICompilationUnit getCompilationUnit() {
		return fCompilationUnit;
	}
	/**
	 * Returns the length.
	 * @return int
	 */
	public int getSelectionLength() {
		return fLength;
	}
	/**
	 * Returns the offset.
	 * @return int
	 */
	public int getSelectionOffset() {
		return fOffset;
	}
	public CompilationUnit getASTRoot() {
		if (fASTRoot == null) {
			fASTRoot= ASTProvider.getASTProvider().getAST(fCompilationUnit, ASTProvider.WAIT_YES, null);
			if (fASTRoot == null) {