private String createErrorMessage(String message) {
            return message + " (template: " + template + ") " + writer.getDebugInfo();
        }
A BlockOperation that repeats a template for each value referenced by the block. Each iteration pushes
a state to the writer that includes key, value, key.first, and key.last context properties. The name
of the context property can be customized in the template.
smithy-utils/src/main/java/software/amazon/smithy/utils/CodeFormatter.java