diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
index 465bc13607a08f02e8f68af4bf79cbaf9b17924c..ba4b19ed1d8c8bf08645123cfc3b48077ef4201e 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Location.java
@@ -40,4 +40,37 @@ public class Location {
         return file + "(" + (lineNr + 1) + ")";
     }
 
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((file == null) ? 0 : file.hashCode());
+        result = prime * result + lineNr;
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        Location other = (Location) obj;
+        if (lineNr != other.lineNr) {
+            return false;
+        }
+        if (file == null) {
+            if (other.file != null) {
+                return false;
+            }
+        } else if (!file.equals(other.file)) {
+            return false;
+        }
+        return true;
+    }
 }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
index 273df22d8ff44b4cd3140abaaf0b7f0edfcfd260..5aeb19aef390a62bb570048197c01df058ae8490 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/Problem.java
@@ -25,6 +25,7 @@ package com.oracle.truffle.r.test.packages.analyzer;
 import java.util.Comparator;
 import java.util.Objects;
 
+import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackage;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 
@@ -35,10 +36,12 @@ public abstract class Problem {
 
     private final RPackageTestRun pkgTestRun;
     private final Location location;
+    private final Detector<?> detector;
 
-    protected Problem(RPackageTestRun pkg, Location location) {
+    protected Problem(RPackageTestRun pkg, Detector<?> detector, Location location) {
         this.pkgTestRun = Objects.requireNonNull(pkg);
         this.location = Objects.requireNonNull(location);
+        this.detector = Objects.requireNonNull(detector);
     }
 
     public RPackage getPackage() {
@@ -53,6 +56,10 @@ public abstract class Problem {
         return location;
     }
 
+    public Detector<?> getDetector() {
+        return detector;
+    }
+
     /**
      * Returns a one-line summary of the problem (e.g.
      * <q>RuntimeException occurred</q>).
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
index b904fd36eff91bf02a70ca8c6301002b5d562706..b71512b5e51415511a5add23996e8ed1c71343a0 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/Detector.java
@@ -23,6 +23,7 @@
 package com.oracle.truffle.r.test.packages.analyzer.detectors;
 
 import java.util.Collection;
+import java.util.LinkedList;
 
 import com.oracle.truffle.r.test.packages.analyzer.Location;
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
@@ -33,14 +34,23 @@ public abstract class Detector<T> {
     /** Semantics: If a child reports an error for a particular location, the parent doesn't. */
     protected Detector<?> parent;
 
+    protected final Collection<Detector<?>> children = new LinkedList<>();
+
     public Detector(Detector<?> parent) {
         this.parent = parent;
+        if (parent != null) {
+            parent.children.add(this);
+        }
     }
 
     public Detector<?> getParent() {
         return parent;
     }
 
+    public Collection<Detector<?>> getChildren() {
+        return children;
+    }
+
     public abstract String getName();
 
     /**
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
index 87f184b6bf576bdcedc86894d6debe93f4b37937..8cd40a6d7176a75ebbad84e15cd8e042eaf1f5a9 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DiffDetector.java
@@ -60,7 +60,7 @@ public class DiffDetector extends Detector<List<DiffChunk>> {
             } else {
                 summary = "Major difference in test output";
             }
-            problems.add(new DiffProblem(pkg, diffChunk.getLocation(), summary, diffChunk));
+            problems.add(new DiffProblem(pkg, this, diffChunk.getLocation(), summary, diffChunk));
         }
         return problems;
     }
@@ -78,8 +78,8 @@ public class DiffDetector extends Detector<List<DiffChunk>> {
         private final String summary;
         private final DiffChunk diffChunk;
 
-        protected DiffProblem(RPackageTestRun pkg, Location location, String summary, DiffChunk diffChunk) {
-            super(pkg, location);
+        protected DiffProblem(RPackageTestRun pkg, DiffDetector detector, Location location, String summary, DiffChunk diffChunk) {
+            super(pkg, detector, location);
             this.summary = Objects.requireNonNull(summary);
             this.diffChunk = Objects.requireNonNull(diffChunk);
         }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java
new file mode 100644
index 0000000000000000000000000000000000000000..c9c7e2a50775cd3b65c2f9f2db737a552e29f617
--- /dev/null
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/DummyDetector.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.r.test.packages.analyzer.detectors;
+
+import java.util.Collection;
+import java.util.Collections;
+
+import com.oracle.truffle.r.test.packages.analyzer.Location;
+import com.oracle.truffle.r.test.packages.analyzer.Problem;
+import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
+
+public final class DummyDetector extends Detector<Void> {
+
+    public static final DummyDetector INSTANCE = new DummyDetector();
+
+    private DummyDetector() {
+        super(null);
+    }
+
+    @Override
+    public String getName() {
+        return "Dummy detector";
+    }
+
+    @Override
+    public Collection<Problem> detect(RPackageTestRun pkgTestRun, Location startLineLocation, Void body) {
+        return Collections.emptyList();
+    }
+
+}
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
index 0e44c19aa6f47c95d7b492f7235000385a642347..b63d31b1d5a274a6fcc4bee78685afc50b058885 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/InstallationProblemDetector.java
@@ -52,8 +52,7 @@ public class InstallationProblemDetector extends LineDetector {
         for (String line : body) {
             Matcher matcher = pattern.matcher(line);
             if (matcher.matches()) {
-                return Collections.singletonList(
-                                new PackageInstallationProblem(pkg, new Location(startLocation.file, lineNr), line));
+                return Collections.singletonList(new PackageInstallationProblem(pkg, this, new Location(startLocation.file, lineNr), line));
             }
             ++lineNr;
         }
@@ -64,8 +63,8 @@ public class InstallationProblemDetector extends LineDetector {
 
         private final String message;
 
-        public PackageInstallationProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        public PackageInstallationProblem(RPackageTestRun pkg, InstallationProblemDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
index 4208e2f90de8dc47da6738eab3289a690a30dfab..6f304037442499e61d0c18c2ed1673139cc08996 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RErrorDetector.java
@@ -68,7 +68,7 @@ public class RErrorDetector extends LineDetector {
                     message = it.next();
                     ++i;
                 }
-                problems.add(new RErrorProblem(pkg, new Location(startLocation.file, i + lineOffset), callString, message));
+                problems.add(new RErrorProblem(pkg, this, new Location(startLocation.file, i + lineOffset), callString, message));
             }
         }
 
@@ -80,8 +80,8 @@ public class RErrorDetector extends LineDetector {
         private final String callString;
         private final String message;
 
-        protected RErrorProblem(RPackageTestRun pkg, Location location, String callString, String message) {
-            super(pkg, location);
+        protected RErrorProblem(RPackageTestRun pkg, RErrorDetector detector, Location location, String callString, String message) {
+            super(pkg, detector, location);
             this.callString = callString;
             this.message = message;
         }
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
index 43793ec9c94d366454a64a58afe0eeeb5d0bfa55..56b5e78cedd8a748cc08ebf527e7f1632dedea1d 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/RInternalErrorDetector.java
@@ -54,7 +54,7 @@ public class RInternalErrorDetector extends LineDetector {
             int indexOf = line.indexOf(P);
             if (indexOf != -1) {
                 String message = line.substring(indexOf + P.length());
-                problems.add(new RInternalErrorProblem(pkg, new Location(startLocation.file, lineNr), message));
+                problems.add(new RInternalErrorProblem(pkg, this, new Location(startLocation.file, lineNr), message));
             }
             ++lineNr;
         }
@@ -65,8 +65,8 @@ public class RInternalErrorDetector extends LineDetector {
 
         private final String message;
 
-        protected RInternalErrorProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected RInternalErrorProblem(RPackageTestRun pkg, RInternalErrorDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
index 94e508b463e94e78f97489f2d6d258c80fdd5d8f..7e3c2ebbc09f66003d3d816d376bcf2f185efd8b 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/SegfaultDetector.java
@@ -63,7 +63,7 @@ public class SegfaultDetector extends LineDetector {
             ++lineNr;
         }
         if (collect) {
-            return Collections.singleton(new SegfaultProblem(pkg, new Location(startLocation.file, lineNr), segfaultMessage.toString()));
+            return Collections.singleton(new SegfaultProblem(pkg, this, new Location(startLocation.file, lineNr), segfaultMessage.toString()));
         }
         return Collections.emptyList();
     }
@@ -72,8 +72,8 @@ public class SegfaultDetector extends LineDetector {
 
         private final String message;
 
-        protected SegfaultProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected SegfaultProblem(RPackageTestRun pkg, SegfaultDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
index d9e2379809f60ad71c826ccf0a1a7798d52ac380..99f270940e23845ce25a4c3b260b9f278ca748d4 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/detectors/UnsupportedSpecializationDetector.java
@@ -60,7 +60,7 @@ public class UnsupportedSpecializationDetector extends LineDetector {
             if (matcher.find()) {
                 message = matcher.group("MSG");
                 problemStartLine = lineNr;
-                problems.add(new UnsupportedSpecializationProblem(pkg, new Location(startLocation.file, problemStartLine), message));
+                problems.add(new UnsupportedSpecializationProblem(pkg, this, new Location(startLocation.file, problemStartLine), message));
             }
             ++lineNr;
         }
@@ -69,8 +69,8 @@ public class UnsupportedSpecializationDetector extends LineDetector {
 
     private static class UnsupportedSpecializationProblem extends Problem {
 
-        protected UnsupportedSpecializationProblem(RPackageTestRun pkg, Location location, String message) {
-            super(pkg, location);
+        protected UnsupportedSpecializationProblem(RPackageTestRun pkg, UnsupportedSpecializationDetector detector, Location location, String message) {
+            super(pkg, detector, location);
             this.message = message;
         }
 
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
index ff4ef7de99fc87760a21bca94bc92b85dbc588cc..58f85539eebd4eae9cdd6807fa52d8f81aa8d74f 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/AbstractDumper.java
@@ -24,11 +24,15 @@ package com.oracle.truffle.r.test.packages.analyzer.dump;
 
 import java.util.Collection;
 import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
+import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackage;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 import com.oracle.truffle.r.test.packages.analyzer.parser.LogFileParseException;
@@ -60,6 +64,42 @@ public abstract class AbstractDumper {
         return problems.stream().collect(Collectors.groupingBy(p -> new ProblemContent(p)));
     }
 
+    protected static Collection<Problem> eliminateRedundantProblems(Collection<Problem> problems) {
+        // build detector hierarchy
+        Set<Detector<?>> collect = problems.stream().map(p -> p.getDetector()).collect(Collectors.toSet());
+        Map<Detector<?>, Collection<Detector<?>>> hierarchy = new HashMap<>();
+        for (Detector<?> detector : collect) {
+            hierarchy.put(detector, collectChildrenRecursive(detector));
+        }
+
+        Map<Detector<?>, List<Problem>> collect2 = problems.stream().collect(Collectors.groupingBy(p -> p.getDetector()));
+
+        return problems.stream().filter(p -> isIncluded(p, hierarchy, collect2)).collect(Collectors.toList());
+    }
+
+    /**
+     * Returns {@code false} if any of the problem detector's children has reported a problem in the
+     * same location. Returns {@code true} otherwise.
+     */
+    private static boolean isIncluded(Problem p, Map<Detector<?>, Collection<Detector<?>>> hierarchy, Map<Detector<?>, List<Problem>> collect2) {
+        Collection<Detector<?>> children = hierarchy.get(p.getDetector());
+        for (Detector<?> childDetector : children) {
+            for (Problem childProblem : collect2.get(childDetector)) {
+                if (childProblem.getLocation().equals(p.getLocation())) {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+    private static Collection<Detector<?>> collectChildrenRecursive(Detector<?> detector) {
+        Collection<Detector<?>> all = new LinkedList<>();
+        all.addAll(detector.getChildren());
+        detector.getChildren().stream().forEach(c -> all.addAll(collectChildrenRecursive(c)));
+        return all;
+    }
+
     protected static class ProblemContent {
 
         final Problem representitive;
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
index 876c5fae56f88bc933d8d305a16e3970824a2049..ccb9666c6ddfa27accffd3f98c7889a6a9c6b701 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/dump/HTMLDumper.java
@@ -70,23 +70,25 @@ public class HTMLDumper extends AbstractDumper {
     }
 
     @Override
-    public void dump(Collection<RPackage> problems, Collection<LogFileParseException> parseErrors) {
+    public void dump(Collection<RPackage> packages, Collection<LogFileParseException> parseErrors) {
         try {
             createAndCheckOutDir();
-            dumpIndexFile(problems, parseErrors);
+            dumpIndexFile(packages, parseErrors);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 
-    private void dumpIndexFile(Collection<RPackage> problems, Collection<LogFileParseException> parseErrors) {
+    private void dumpIndexFile(Collection<RPackage> packages, Collection<LogFileParseException> parseErrors) {
         Path indexFile = destDir.resolve("index.html");
 
         try (BufferedWriter bw = Files.newBufferedWriter(indexFile, CREATE, TRUNCATE_EXISTING, WRITE)) {
             HTMLBuilder builder = new HTMLBuilder(new PrintWriter(bw));
 
-            Collection<Problem> allProblems = collectAllProblems(problems);
-            Collection<RPackageTestRun> allTestRuns = collectTestRuns(problems);
+            Collection<Problem> allProblems = collectAllProblems(packages);
+            Collection<RPackageTestRun> allTestRuns = collectTestRuns(packages);
+
+            allProblems = eliminateRedundantProblems(allProblems);
 
             Tag errorDistributionTable = generateTypeDistributionTable(builder, groupByType(allProblems));
             Tag pkgDistributionTable = generateTestRunDistributionTable(builder, groupByTestRuns(allTestRuns, allProblems));
diff --git a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
index 9aacf507de06db38cfb78969224820351eb58d33..1ebc0e56abc69511d62503bed73256228061495e 100644
--- a/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
+++ b/com.oracle.truffle.r.test.packages.analyzer/src/com/oracle/truffle/r/test/packages/analyzer/parser/LogFileParser.java
@@ -30,16 +30,20 @@ import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Set;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import com.oracle.truffle.r.test.packages.analyzer.Location;
 import com.oracle.truffle.r.test.packages.analyzer.Problem;
 import com.oracle.truffle.r.test.packages.analyzer.detectors.Detector;
+import com.oracle.truffle.r.test.packages.analyzer.detectors.DummyDetector;
 import com.oracle.truffle.r.test.packages.analyzer.detectors.LineDetector;
 import com.oracle.truffle.r.test.packages.analyzer.model.RPackageTestRun;
 import com.oracle.truffle.r.test.packages.analyzer.parser.DiffParser.DiffChunk;
@@ -139,7 +143,7 @@ public class LogFileParser {
                 consumeLine();
                 int idx = curLine.text.indexOf(Token.CONTENT_MALFORMED.linePrefix);
                 String fileNameStr = curLine.text.substring(idx + Token.CONTENT_MALFORMED.linePrefix.length()).trim();
-                checkResults.problems.add(new ContentMalformedProblem(pkg, getCurrentLocation(), fileNameStr));
+                checkResults.problems.add(new ContentMalformedProblem(pkg, DummyDetector.INSTANCE, getCurrentLocation(), fileNameStr));
             } else if (la.text.contains(Token.OUTPUT_MISMATCH_FASTR.linePrefix)) {
                 consumeLine();
                 // extract file name of output file
@@ -149,7 +153,7 @@ public class LogFileParser {
                 Path outputFile = logFile.path.resolveSibling(Paths.get("testfiles", "fastr", fileNameStr));
 
                 // report the problem
-                checkResults.problems.add(new OutputMismatchProblem(pkg, getCurrentLocation(), fileNameStr));
+                checkResults.problems.add(new OutputMismatchProblem(pkg, DummyDetector.INSTANCE, getCurrentLocation(), fileNameStr));
 
                 if (!Files.isReadable(outputFile)) {
                     LOGGER.warning("Cannot read output file " + outputFile);
@@ -352,23 +356,25 @@ public class LogFileParser {
             assert startLineNr >= 0;
             startLocation = new Location(file, startLineNr);
         }
-        List<Problem> problems = new LinkedList<>();
+// List<Problem> problems = new LinkedList<>();
+        Map<LineDetector, Collection<Problem>> problems = new HashMap<>();
         Collection<LineDetector> collection = detectorsTable.get(start.name());
         if (collection != null) {
             for (LineDetector detector : collection) {
                 Collection<Problem> detectedProblems = detector.detect(pkg, startLocation, body);
                 if (detectedProblems != null) {
-                    problems.addAll(detectedProblems);
+                    problems.put(detector, detectedProblems);
                 }
             }
         }
         for (LineDetector detector : anyDetectors) {
             Collection<Problem> detectedProblems = detector.detect(pkg, startLocation, body);
             if (detectedProblems != null) {
-                problems.addAll(detectedProblems);
+                problems.put(detector, detectedProblems);
             }
         }
-        return problems;
+
+        return problems.values().stream().flatMap(p -> p.stream()).collect(Collectors.toList());
     }
 
     private Collection<Problem> applyTestResultDetectors(List<DiffChunk> diffChunk) {
@@ -663,8 +669,8 @@ public class LogFileParser {
 
         private final String details;
 
-        protected OutputMismatchProblem(RPackageTestRun pkg, Location location, String details) {
-            super(pkg, location);
+        protected OutputMismatchProblem(RPackageTestRun pkg, Detector<?> detector, Location location, String details) {
+            super(pkg, detector, location);
             this.details = details;
         }
 
@@ -698,8 +704,8 @@ public class LogFileParser {
 
         private final String details;
 
-        protected ContentMalformedProblem(RPackageTestRun pkg, Location location, String details) {
-            super(pkg, location);
+        protected ContentMalformedProblem(RPackageTestRun pkg, Detector<?> detector, Location location, String details) {
+            super(pkg, detector, location);
             this.details = details;
         }