diff --git a/doc/TODO.txt b/doc/TODO.txt
index 2b19a12a..e7e0105c 100644
--- a/doc/TODO.txt
+++ b/doc/TODO.txt
@@ -254,8 +254,6 @@ o Caching
   - Test that caching is actually performed (speedup + same results)
   - Test the modifier characters correctly influence the cache (also when
     added/removed)
-o CSG normalization
-  - Empty top-level intersection
 o other tests
   - export
   - cmd-line tests
diff --git a/testdata/scad/bugs/intersection-prune-test.scad b/testdata/scad/bugs/intersection-prune-test.scad
new file mode 100644
index 00000000..3c6df7aa
--- /dev/null
+++ b/testdata/scad/bugs/intersection-prune-test.scad
@@ -0,0 +1,9 @@
+// This tree cannot be pruned inline, but will still result in an empty CSG tree
+// Crashes OpenSCAD-2011.12. Bug fixed in 14e4f3bb
+intersection() {
+ union() {
+  cube();
+  translate([4,0,0]) cube();
+ }
+ translate([2,0,0]) cube();
+}
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 931fb123..665bd92f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -619,6 +619,7 @@ list(APPEND CGALPNGTEST_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/include-
                            ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/use-tests.scad)
 list(APPEND OPENCSGTEST_FILES ${CGALPNGTEST_FILES})
 list(APPEND OPENCSGTEST_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/bbox-transform-bug.scad)
+list(APPEND OPENCSGTEST_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/bugs/intersection-prune-test.scad)
 list(APPEND THROWNTOGETHERTEST_FILES ${OPENCSGTEST_FILES})
 
 list(APPEND CGALSTLSANITYTEST_FILES ${CMAKE_SOURCE_DIR}/../testdata/scad/misc/normal-nan.scad)
diff --git a/tests/regression/opencsgtest/intersection-prune-test-expected.png b/tests/regression/opencsgtest/intersection-prune-test-expected.png
new file mode 100644
index 00000000..50d838c3
Binary files /dev/null and b/tests/regression/opencsgtest/intersection-prune-test-expected.png differ
diff --git a/tests/regression/throwntogethertest/intersection-prune-test-expected.png b/tests/regression/throwntogethertest/intersection-prune-test-expected.png
new file mode 100644
index 00000000..50d838c3
Binary files /dev/null and b/tests/regression/throwntogethertest/intersection-prune-test-expected.png differ