findAllIncubating()
                .map { node -> toVersionIncubating(sourceFile, node) }
                .forEach { (version, incubating) ->
                    versionsToIncubating.getOrPut(version) { mutableSetOf() }.add(incubating)
                }
        }
        return versionsToIncubating
    }

    private
    fun CompilationUnit.findAllIncubating() =
        findAll(Node::class.java).filter { it.isIncubating }

                byCategory.getOrPut(toCategory(version, file.nameWithoutExtension)) {
                    mutableMapOf()
                }.getOrPut(file.nameWithoutExtension) {
                    mutableSetOf()
                }.add(problem)
            }
        }
        generateReport(byCategory)
    }

    private
    fun toCategory(version: String, gradleModule: String) = when {