in simple_language_plugin/src/main/java/org/intellij/sdk/language/psi/impl/SimplePsiImplUtil.java [41:49]
public static PsiElement setName(SimpleProperty element, String newName) {
ASTNode keyNode = element.getNode().findChildByType(SimpleTypes.KEY);
if (keyNode != null) {
SimpleProperty property = SimpleElementFactory.createProperty(element.getProject(), newName);
ASTNode newKeyNode = property.getFirstChild().getNode();
element.getNode().replaceChild(keyNode, newKeyNode);
}
return element;
}