Bug 38892 ASTRewrite should support copying nodes more than once.
M1 Try is result currently in an exception: org.eclipse.jdt.internal.corext.Assert$AssertionFailedException: assertion failed; Node used as more than one copy source at java.lang.Throwable.<init>(Throwable.java) at java.lang.Throwable.<init>(Throwable.java) at org.eclipse.jdt.internal.corext.Assert$AssertionFailedException.<init> (Assert.java:55) at org.eclipse.jdt.internal.corext.Assert.isTrue(Assert.java:136) at org.eclipse.jdt.internal.corext.dom.ASTRewrite.createCopy (ASTRewrite.java:289)
org.eclipse.jdt.ui.tests/ui/org/eclipse/jdt/ui/tests/astrewrite/ASTRewritingMoveCodeTest.java
buf.append("public class E {\n");
		buf.append("    public void foo() {\n");
		buf.append("        if (i == 0) {\n");
		buf.append("            foo();\n");
		buf.append("            i++; // comment\n");
		buf.append("            i++;\n");
		buf.append("        }\n");
		buf.append("    }\n");
		buf.append("}\n");
		ICompilationUnit cu= pack1.createCompilationUnit("E.java", buf.toString(), false, null);
		
		CompilationUnit astRoot= AST.parseCompilationUnit(cu, false);
		ASTRewrite rewrite= new ASTRewrite(astRoot);
		AST ast= astRoot.getAST();
		assertTrue("Code has errors", (astRoot.getFlags() & ASTNode.MALFORMED) == 0);
		
		TypeDeclaration type= findTypeDeclaration(astRoot, "E");
		MethodDeclaration methodDecl= findMethodDeclaration(type, "foo");
		{
			List statements= methodDecl.getBody().statements();
			IfStatement ifStatement= (IfStatement) statements.get(0);
			List ifStatementBody= ((Block) ifStatement.getThenStatement()).statements();
			
			ASTNode last= (ASTNode) ifStatementBody.get(ifStatementBody.size() - 1);
			
			ASTNode collapsed= rewrite.collapseNodes(ifStatementBody, 0, ifStatementBody.size());
			ASTNode placeholder= rewrite.createCopy(collapsed);			
			
			ReturnStatement returnStatement= ast.newReturnStatement();
			rewrite.markAsReplaced(last, returnStatement);