}

    @Override
    public void describeTo(Description description) {
        description
                .appendText("a ProjectBuildingResult with location ")
                .appendText(formatLocation(columnNumber, lineNumber));
    }

    private String formatLocation(int columnNumber, int lineNumber) {

            description.appendText("was a ProjectBuildingResult with messages ");
            String messages = r.getProblems().stream()
                    .map(ModelProblem::getMessage)
                    .map(m -> "\"" + m + "\"" + System.lineSeparator())
                    .collect(joining(", "));
            description.appendText(messages);
        }
    }