compat/maven-embedder/src/main/java/org/apache/maven/cli/props/MavenPropertiesLoader.java [81:108]:
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    private static void loadIncludes(Path configProp, MavenProperties configProps, UnaryOperator<String> callback)
            throws IOException {
        String includes = configProps.get(INCLUDES_PROPERTY);
        if (includes != null) {
            includes = substVars(includes, INCLUDES_PROPERTY, configProps, callback);
            StringTokenizer st = new StringTokenizer(includes, "?\",", true);
            if (st.countTokens() > 0) {
                String location;
                do {
                    location = nextLocation(st);
                    if (location != null) {
                        boolean mandatory = true;
                        if (location.startsWith("?")) {
                            mandatory = false;
                            location = location.substring(1);
                        }
                        Path path = configProp.resolveSibling(location);
                        MavenProperties props = loadPropertiesFile(path, mandatory, s -> {
                            var v = callback.apply(s);
                            return v != null ? v : configProps.getProperty(s);
                        });
                        configProps.putAll(props);
                    }
                } while (location != null);
            }
        }
        configProps.remove(INCLUDES_PROPERTY);
    }
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impl/maven-cli/src/main/java/org/apache/maven/cling/props/MavenPropertiesLoader.java [80:107]:
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    private static void loadIncludes(Path configProp, MavenProperties configProps, UnaryOperator<String> callback)
            throws IOException {
        String includes = configProps.get(INCLUDES_PROPERTY);
        if (includes != null) {
            includes = substVars(includes, INCLUDES_PROPERTY, configProps, callback);
            StringTokenizer st = new StringTokenizer(includes, "?\",", true);
            if (st.countTokens() > 0) {
                String location;
                do {
                    location = nextLocation(st);
                    if (location != null) {
                        boolean mandatory = true;
                        if (location.startsWith("?")) {
                            mandatory = false;
                            location = location.substring(1);
                        }
                        Path path = configProp.resolveSibling(location);
                        MavenProperties props = loadPropertiesFile(path, mandatory, s -> {
                            var v = callback.apply(s);
                            return v != null ? v : configProps.getProperty(s);
                        });
                        configProps.putAll(props);
                    }
                } while (location != null);
            }
        }
        configProps.remove(INCLUDES_PROPERTY);
    }
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