diff --git a/src/db/db/dbEdgesUtils.cc b/src/db/db/dbEdgesUtils.cc
index 099961f30..f5971dafd 100644
--- a/src/db/db/dbEdgesUtils.cc
+++ b/src/db/db/dbEdgesUtils.cc
@@ -207,4 +207,71 @@ EdgeSegmentSelector::process (const db::Edge &edge, std::vector<db::Edge> &res)
   }
 }
 
+// -------------------------------------------------------------------------------------------------------------
+//  EdgeAngleChecker implementation
+
+EdgeAngleChecker::EdgeAngleChecker (double angle_start, bool include_angle_start, double angle_end, bool include_angle_end)
+{
+  m_t_start = db::CplxTrans(1.0, angle_start, false, db::DVector ());
+  m_t_end = db::CplxTrans(1.0, angle_end, false, db::DVector ());
+
+  m_include_start = include_angle_start;
+  m_include_end = include_angle_end;
+
+  m_big_angle = (angle_end - angle_start + db::epsilon) > 180.0;
+  m_all = (angle_end - angle_start - db::epsilon) > 360.0;
+}
+
+bool
+EdgeAngleChecker::check (const db::Vector &a, const db::Vector &b) const
+{
+  db::DVector vout (b);
+
+  db::DVector v1 = m_t_start * a;
+  db::DVector v2 = m_t_end * a;
+
+  int vps1 = db::vprod_sign (v1, vout);
+  int vps2 = db::vprod_sign (v2, vout);
+  bool opp1 = vps1 == 0 && (db::sprod_sign (v1, vout) < 0);
+  bool opp2 = vps2 == 0 && (db::sprod_sign (v2, vout) < 0);
+
+  bool vp1 = !opp1 && (m_include_start ? (db::vprod_sign (v1, vout) >= 0) : (db::vprod_sign (v1, vout) > 0));
+  bool vp2 = !opp2 && (m_include_end ? (db::vprod_sign (v2, vout) <= 0) : (db::vprod_sign (v2, vout) < 0));
+
+  if (m_big_angle && (vp1 || vp2)) {
+    return true;
+  } else if (! m_big_angle && vp1 && vp2) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+// -------------------------------------------------------------------------------------------------------------
+//  EdgeOrientationFilter implementation
+
+EdgeOrientationFilter::EdgeOrientationFilter (double amin, bool include_amin, double amax, bool include_amax, bool inverse)
+  : m_inverse (inverse), m_checker (amin, include_amin, amax, include_amax)
+{
+  //  .. nothing yet ..
+}
+
+EdgeOrientationFilter::EdgeOrientationFilter (double a, bool inverse)
+  : m_inverse (inverse), m_checker (a, true, a, true)
+{
+  //  .. nothing yet ..
+}
+
+bool
+EdgeOrientationFilter::selected (const db::Edge &edge) const
+{
+  //  NOTE: this edge normalization confines the angle to a range between (-90 .. 90] (-90 excluded).
+  //  A horizontal edge has 0 degree, a vertical one has 90 degree.
+  if (edge.dx () < 0 || (edge.dx () == 0 && edge.dy () < 0)) {
+    return m_checker (db::Vector (edge.ortho_length (), 0), -edge.d ()) != m_inverse;
+  } else {
+    return m_checker (db::Vector (edge.ortho_length (), 0), edge.d ()) != m_inverse;
+  }
+}
+
 }
diff --git a/src/db/db/dbEdgesUtils.h b/src/db/db/dbEdgesUtils.h
index 9a08173c4..bfb0650b4 100644
--- a/src/db/db/dbEdgesUtils.h
+++ b/src/db/db/dbEdgesUtils.h
@@ -103,6 +103,41 @@ private:
   db::MagnificationReducer m_vars;
 };
 
+/**
+ *  @brief An angle detector
+ *
+ *  This detector can check whether the angle between two edges is within a certain angle interval.
+ *  It takes two edges: a and b. If b "turns left" (b following a), the angle will be positive, if it "turns" right,
+ *  the angle will be negative. The angle can be between -180 and 180 degree. The case of reflection
+ *  (exactly 180 degree) is not considered.
+ *
+ *  The constraint can be given in terms of a minimum and maximum angle. "include" specifies whether the
+ *  angle value itself is included. The operator() will return true, if the angle between the given
+ *  edges a and b in matching the constraint.
+ */
+class DB_PUBLIC EdgeAngleChecker
+{
+public:
+  EdgeAngleChecker (double angle_start, bool include_angle_start, double angle_end, bool include_angle_end);
+
+  bool operator() (const db::Edge &a, const db::Edge &b) const
+  {
+    return m_all || check (a.d (), b.d ());
+  }
+
+  bool operator() (const db::Vector &a, const db::Vector &b) const
+  {
+    return m_all || check (a, b);
+  }
+
+private:
+  db::CplxTrans m_t_start, m_t_end;
+  bool m_include_start, m_include_end;
+  bool m_big_angle, m_all;
+
+  bool check (const db::Vector &a, const db::Vector &b) const;
+};
+
 /**
  *  @brief An edge orientation filter for use with Edges::filter or Edges::filtered
  *
@@ -126,12 +161,7 @@ struct DB_PUBLIC EdgeOrientationFilter
    *  This filter will filter out all edges whose angle against x axis
    *  is larger or equal to amin and less than amax.
    */
-  EdgeOrientationFilter (double amin, double amax, bool inverse)
-    : m_inverse (inverse), m_exact (false)
-  {
-    m_emin = db::DVector (cos (amin * M_PI / 180.0), sin (amin * M_PI / 180.0));
-    m_emax = db::DVector (cos (amax * M_PI / 180.0), sin (amax * M_PI / 180.0));
-  }
+  EdgeOrientationFilter (double amin, bool include_amin, double amax, bool include_amax, bool inverse);
 
   /**
    *  @brief Constructor
@@ -142,33 +172,12 @@ struct DB_PUBLIC EdgeOrientationFilter
    *  This filter will filter out all edges whose angle against x axis
    *  is equal to a.
    */
-  EdgeOrientationFilter (double a, bool inverse)
-    : m_inverse (inverse), m_exact (true)
-  {
-    m_emin = db::DVector (cos (a * M_PI / 180.0), sin (a * M_PI / 180.0));
-  }
+  EdgeOrientationFilter (double a, bool inverse);
 
   /**
    *  @brief Returns true if the edge orientation matches the criterion
    */
-  virtual bool selected (const db::Edge &edge) const
-  {
-    int smin = db::vprod_sign (m_emin, db::DVector (edge.d ()));
-    if (m_exact) {
-      if (! m_inverse) {
-        return smin == 0;
-      } else {
-        return smin != 0;
-      }
-    } else {
-      int smax = db::vprod_sign (m_emax, db::DVector (edge.d ()));
-      if (! m_inverse) {
-        return (smin >= 0 && smax < 0) || (smax > 0 && smin <= 0);
-      } else {
-        return ! ((smin >= 0 && smax < 0) || (smax > 0 && smin <= 0));
-      }
-    }
-  }
+  virtual bool selected (const db::Edge &edge) const;
 
   /**
    *  @brief This filter is not isotropic
@@ -197,8 +206,8 @@ struct DB_PUBLIC EdgeOrientationFilter
 private:
   db::DVector m_emin, m_emax;
   bool m_inverse;
-  bool m_exact;
   db::MagnificationAndOrientationReducer m_vars;
+  EdgeAngleChecker m_checker;
 };
 
 /**
diff --git a/src/db/db/dbRegionProcessors.cc b/src/db/db/dbRegionProcessors.cc
index c2cf6c8a7..9134dc12f 100644
--- a/src/db/db/dbRegionProcessors.cc
+++ b/src/db/db/dbRegionProcessors.cc
@@ -31,15 +31,9 @@ namespace db
 //  CornerDetectorCore implementation
 
 CornerDetectorCore::CornerDetectorCore (double angle_start, bool include_angle_start, double angle_end, bool include_angle_end)
+  : m_checker (angle_start, include_angle_start, angle_end, include_angle_end)
 {
-  m_t_start = db::CplxTrans(1.0, angle_start, false, db::DVector ());
-  m_t_end = db::CplxTrans(1.0, angle_end, false, db::DVector ());
-
-  m_include_start = include_angle_start;
-  m_include_end = include_angle_end;
-
-  m_big_angle = (angle_end - angle_start + db::epsilon) > 180.0;
-  m_all = (angle_end - angle_start - db::epsilon) > 360.0;
+  //  .. nothing yet ..
 }
 
 void CornerDetectorCore::detect_corners (const db::Polygon &poly, const CornerPointDelivery &delivery) const
@@ -57,30 +51,8 @@ void CornerDetectorCore::detect_corners (const db::Polygon &poly, const CornerPo
 
         db::Point pn = ctr [j];
 
-        if (m_all) {
+        if (m_checker (pt - pp, pn - pt)) {
           delivery.make_point (pt);
-        } else {
-
-          db::Vector vin (pt - pp);
-          db::DVector vout (pn - pt);
-
-          db::DVector v1 = m_t_start * vin;
-          db::DVector v2 = m_t_end * vin;
-
-          int vps1 = db::vprod_sign (v1, vout);
-          int vps2 = db::vprod_sign (v2, vout);
-          bool opp1 = vps1 == 0 && (db::sprod_sign (v1, vout) < 0);
-          bool opp2 = vps2 == 0 && (db::sprod_sign (v2, vout) < 0);
-
-          bool vp1 = !opp1 && (m_include_start ? (db::vprod_sign (v1, vout) >= 0) : (db::vprod_sign (v1, vout) > 0));
-          bool vp2 = !opp2 && (m_include_end ? (db::vprod_sign (v2, vout) <= 0) : (db::vprod_sign (v2, vout) < 0));
-
-          if (m_big_angle && (vp1 || vp2)) {
-            delivery.make_point (pt);
-          } else if (! m_big_angle && vp1 && vp2) {
-            delivery.make_point (pt);
-          }
-
         }
 
         pp = pt;
diff --git a/src/db/db/dbRegionProcessors.h b/src/db/db/dbRegionProcessors.h
index 4f9a4f206..d91613148 100644
--- a/src/db/db/dbRegionProcessors.h
+++ b/src/db/db/dbRegionProcessors.h
@@ -27,6 +27,7 @@
 #include "dbCommon.h"
 #include "dbRegionDelegate.h"
 #include "dbPolygonTools.h"
+#include "dbEdgesUtils.h"
 
 namespace db
 {
@@ -97,9 +98,7 @@ public:
   void detect_corners (const db::Polygon &poly, const CornerPointDelivery &delivery) const;
 
 private:
-  db::CplxTrans m_t_start, m_t_end;
-  bool m_include_start, m_include_end;
-  bool m_big_angle, m_all;
+  db::EdgeAngleChecker m_checker;
 };
 
 /**
diff --git a/src/db/db/gsiDeclDbCompoundOperation.cc b/src/db/db/gsiDeclDbCompoundOperation.cc
index 9ade51e65..9ccc49e7f 100644
--- a/src/db/db/gsiDeclDbCompoundOperation.cc
+++ b/src/db/db/gsiDeclDbCompoundOperation.cc
@@ -326,10 +326,10 @@ static db::CompoundRegionOperationNode *new_edge_length_filter (db::CompoundRegi
   return new db::CompoundRegionEdgeFilterOperationNode (new db::EdgeLengthFilter (lmin, lmax, inverse), input, true /*processor is owned*/);
 }
 
-static db::CompoundRegionOperationNode *new_edge_orientation_filter (db::CompoundRegionOperationNode *input, bool inverse, double amin, double amax)
+static db::CompoundRegionOperationNode *new_edge_orientation_filter (db::CompoundRegionOperationNode *input, bool inverse, double amin, bool include_amin, double amax, bool include_amax)
 {
   check_non_null (input, "input");
-  return new db::CompoundRegionEdgeFilterOperationNode (new db::EdgeOrientationFilter (amin, amax, inverse), input, true /*processor is owned*/);
+  return new db::CompoundRegionEdgeFilterOperationNode (new db::EdgeOrientationFilter (amin, include_amin, amax, include_amax, inverse), input, true /*processor is owned*/);
 }
 
 static db::CompoundRegionOperationNode *new_polygons (db::CompoundRegionOperationNode *input, db::Coord e)
@@ -675,7 +675,7 @@ Class<db::CompoundRegionOperationNode> decl_CompoundRegionOperationNode ("db", "
   gsi::constructor ("new_edge_length_filter", &new_edge_length_filter, gsi::arg ("input"), gsi::arg ("inverse", false), gsi::arg ("lmin", 0), gsi::arg ("lmax", std::numeric_limits<db::Edge::distance_type>::max (), "max"),
     "@brief Creates a node filtering edges by their length.\n"
   ) +
-  gsi::constructor ("new_edge_orientation_filter", &new_edge_orientation_filter, gsi::arg ("input"), gsi::arg ("inverse", false), gsi::arg ("amin"), gsi::arg ("amax"),
+  gsi::constructor ("new_edge_orientation_filter", &new_edge_orientation_filter, gsi::arg ("input"), gsi::arg ("inverse", false), gsi::arg ("amin"), gsi::arg ("include_amin"), gsi::arg ("amax"), gsi::arg ("include_amax"),
     "@brief Creates a node filtering edges by their orientation.\n"
   ) +
   gsi::constructor ("new_polygons", &new_polygons, gsi::arg ("input"), gsi::arg ("e", 0),
diff --git a/src/db/db/gsiDeclDbEdges.cc b/src/db/db/gsiDeclDbEdges.cc
index b48d3b76c..0f4398e0f 100644
--- a/src/db/db/gsiDeclDbEdges.cc
+++ b/src/db/db/gsiDeclDbEdges.cc
@@ -206,9 +206,9 @@ static db::Edges with_angle1 (const db::Edges *r, double a, bool inverse)
   return r->filtered (f);
 }
 
-static db::Edges with_angle2 (const db::Edges *r, double amin, double amax, bool inverse)
+static db::Edges with_angle2 (const db::Edges *r, double amin, double amax, bool inverse, bool include_amin, bool include_amax)
 {
-  db::EdgeOrientationFilter f (amin, amax, inverse);
+  db::EdgeOrientationFilter f (amin, include_amin, amax, include_amax, inverse);
   return r->filtered (f);
 }
 
@@ -581,12 +581,17 @@ Class<db::Edges> decl_Edges (decl_dbShapeCollection, "db", "Edges",
     "horizontal = edges.with_orientation(0, true)\n"
     "@/code\n"
   ) +
-  method_ext ("with_angle", with_angle2, gsi::arg ("min_angle"), gsi::arg ("max_angle"), gsi::arg ("inverse"),
+  method_ext ("with_angle", with_angle2, gsi::arg ("min_angle"), gsi::arg ("max_angle"), gsi::arg ("inverse"), gsi::arg ("include_amin", true), gsi::arg ("include_amax", true),
     "@brief Filter the edges by orientation\n"
     "Filters the edges in the edge collection by orientation. If \"inverse\" is false, only "
     "edges which have an angle to the x-axis larger or equal to \"min_angle\" and less than \"max_angle\" are "
     "returned. If \"inverse\" is true, "
-    "edges which do not conform to this criterion are returned."
+    "edges which do not conform to this criterion are returned.\n"
+    "\n"
+    "With \"include_min\" set to true (the default), the minimum angle is included in the criterion while with false, the "
+    "minimum angle itself is not included. Same for \"include_max\".\n"
+    "\n"
+    "The two \"include..\" arguments have been added in version 0.27."
   ) +
   method ("insert", (void (db::Edges::*)(const db::Edge &)) &db::Edges::insert, gsi::arg ("edge"),
     "@brief Inserts an edge\n"
diff --git a/src/db/unit_tests/dbDeepEdgesTests.cc b/src/db/unit_tests/dbDeepEdgesTests.cc
index 08cce0a34..06125dbc8 100644
--- a/src/db/unit_tests/dbDeepEdgesTests.cc
+++ b/src/db/unit_tests/dbDeepEdgesTests.cc
@@ -259,8 +259,8 @@ TEST(5_Filters)
 
     target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (2, 0)), r2);
 
-    db::EdgeOrientationFilter eof1 (0, 1, false);
-    db::EdgeOrientationFilter eof2 (0, 1, true);
+    db::EdgeOrientationFilter eof1 (0, true, 1, true, false);
+    db::EdgeOrientationFilter eof2 (0, true, 1, true, true);
 
     target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (10, 0)), e2.filtered (eof1));
     target.insert (target_top_cell_index, target.get_layer (db::LayerProperties (11, 0)), e2.filtered (eof2));
diff --git a/src/db/unit_tests/dbEdgesTests.cc b/src/db/unit_tests/dbEdgesTests.cc
index 5083e65b1..c9e17596a 100644
--- a/src/db/unit_tests/dbEdgesTests.cc
+++ b/src/db/unit_tests/dbEdgesTests.cc
@@ -200,23 +200,23 @@ TEST(4)
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,200;100,200);(100,0;0,0);(300,0;200,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (50.0, 80.0, false);
+    db::EdgeOrientationFilter f1 (50.0, true, 80.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "(200,0;250,200);(250,-200;300,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (50.0, 80.0, true);
+    db::EdgeOrientationFilter f1 (50.0, true, 80.0, true, true);
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,0;0,200);(0,200;100,200);(100,200;100,0);(100,0;0,0);(250,200;300,0);(300,0;200,0);(200,0;250,-200)");
   }
   {
-    db::EdgeOrientationFilter f1 (0.0, 1.0, false);
+    db::EdgeOrientationFilter f1 (0.0, true, 1.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,200;100,200);(100,0;0,0);(300,0;200,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (-1.0, 1.0, false);
+    db::EdgeOrientationFilter f1 (-1.0, true, 1.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,200;100,200);(100,0;0,0);(300,0;200,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (-1.0, 0.0, false);
+    db::EdgeOrientationFilter f1 (-1.0, true, 0.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "");
   }
   {
@@ -224,15 +224,15 @@ TEST(4)
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,0;0,200);(100,200;100,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (90.0, 91.0, false);
+    db::EdgeOrientationFilter f1 (90.0, true, 91.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,0;0,200);(100,200;100,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (89.0, 91.0, false);
+    db::EdgeOrientationFilter f1 (89.0, true, 91.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "(0,0;0,200);(100,200;100,0)");
   }
   {
-    db::EdgeOrientationFilter f1 (89.0, 90.0, false);
+    db::EdgeOrientationFilter f1 (89.0, true, 90.0, true, false);
     EXPECT_EQ (r.filtered (f1).to_string (), "");
   }
 }
diff --git a/src/drc/drc/built-in-macros/_drc_complex_ops.rb b/src/drc/drc/built-in-macros/_drc_complex_ops.rb
index fcb737383..9296d2a98 100644
--- a/src/drc/drc/built-in-macros/_drc_complex_ops.rb
+++ b/src/drc/drc/built-in-macros/_drc_complex_ops.rb
@@ -1324,7 +1324,9 @@ class DRCOpNodeEdgeOrientationFilter < DRCOpNodeWithCompare
     args = [ n, self.inverse ]
     angle_delta = 1e-6
     args << (self.gt ? self.gt + angle_delta : (self.ge ? self.ge : -180.0))
+    args << (self.gt ? false : true)
     args << (self.lt ? self.lt : (self.le ? self.le + angle_delta : 180.0))
+    args << (self.lt ? false : true)
 
     RBA::CompoundRegionOperationNode::new_edge_orientation_filter(*args)
 
diff --git a/src/drc/drc/built-in-macros/_drc_cop_integration.rb b/src/drc/drc/built-in-macros/_drc_cop_integration.rb
index 949e04e57..d6cfaffa7 100644
--- a/src/drc/drc/built-in-macros/_drc_cop_integration.rb
+++ b/src/drc/drc/built-in-macros/_drc_cop_integration.rb
@@ -334,13 +334,15 @@ CODE
     
     # %DRC%
     # @name area
-    # @brief Selects the primary shape if the area is meeting the condition
+    # @brief Computes the total area or in universal DRC context: selects the primary shape if the area is meeting the condition
     # @synopsis area (in condition)
     # @synopsis area(layer)
     #
     # This function can be used with a layer argument in which case it
-    # is equivalent to "layer.area" (see \Layer#area). Without a layer
-    # argument, "area" represents an area filter for primary shapes in 
+    # is equivalent to "layer.area" (see \Layer#area) and returns the total area of the 
+    # polygons in the layer. 
+    #
+    # Without a layer argument, "area" represents an area filter for primary shapes in 
     # \DRC# expressions (see \Layer#drc and \DRC#area for more details).
     
     # %DRC%
@@ -378,13 +380,15 @@ CODE
 
     # %DRC%
     # @name perimeter
-    # @brief Selects the primary shape if the perimeter is meeting the condition
+    # @brief Computes the total perimeter or in universal DRC context: selects the primary shape if the perimeter is meeting the condition
     # @synopsis perimeter (in condition)
     # @synopsis perimeter(layer)
     #
     # This function can be used with a layer argument in which case it
-    # is equivalent to "layer.perimeter" (see \Layer#perimeter). Without a layer
-    # argument, "perimeter" represents a perimeter filter for primary shapes in 
+    # is equivalent to "layer.perimeter" (see \Layer#perimeter) and returns the
+    # total perimeter of all polygons in the layer.
+    #
+    # Without a layer argument, "perimeter" represents a perimeter filter for primary shapes in 
     # \DRC# expressions (see \Layer#drc and \DRC#perimeter for more details).
 
     # %DRC%
@@ -409,6 +413,27 @@ CODE
     # argument, "rectilinear" represents the rectilinear polygons filter for primary shapes in 
     # \DRC# expressions (see \Layer#drc and \DRC#rectilinear for more details).
 
+    # %DRC%
+    # @name length (in condition)
+    # @brief Computes the total edge length of an edge layer or in universal DRC context: selects edges based on a length condition
+    # @synopsis length (in condition)
+    # @synopsis length(layer)
+    #
+    # This function can be used with a layer argument in which case it
+    # is equivalent to "layer.length" (see \Layer#length). Without a layer
+    # argument, "length" represents the edge length filter on the primary shape edges in 
+    # \DRC# expressions (see \Layer#drc and \DRC#length for more details). In this context,
+    # the operation acts similar to \Layer#with_length.
+
+    # %DRC%
+    # @name angle (in condition)
+    # @brief In universal DRC context: selects edges based on their orientation
+    # @synopsis angle (in condition)
+    #
+    # "angle" represents the edge orientation filter on the primary shape edges in
+    # \DRC# expressions (see \Layer#drc and \DRC#angle for more details). In this context,
+    # the operation acts similar to \Layer#with_angle.
+
     %w(
       area
       holes
@@ -417,6 +442,8 @@ CODE
       perimeter
       rectangles
       rectilinear
+      length
+      angle
     ).each do |f|
       # NOTE: these methods are fallback for the respective global ones which route to DRCLayer or here.
       eval <<"CODE"
diff --git a/src/drc/drc/built-in-macros/_drc_engine.rb b/src/drc/drc/built-in-macros/_drc_engine.rb
index 78146057d..b03b9c4a0 100644
--- a/src/drc/drc/built-in-macros/_drc_engine.rb
+++ b/src/drc/drc/built-in-macros/_drc_engine.rb
@@ -1574,6 +1574,7 @@ CODE
     %w(
       and
       andnot
+      angle
       area
       bbox 
       centers
diff --git a/src/drc/drc/built-in-macros/_drc_layer.rb b/src/drc/drc/built-in-macros/_drc_layer.rb
index ea74b4abe..7ecec71c6 100644
--- a/src/drc/drc/built-in-macros/_drc_layer.rb
+++ b/src/drc/drc/built-in-macros/_drc_layer.rb
@@ -2780,7 +2780,7 @@ CODE
         @engine._cmd(self.data, :length) * @engine.dbu.to_f
       end
     end
-    
+
     # %DRC%
     # @name flatten
     # @brief Flattens the layer
diff --git a/src/drc/unit_tests/drcGenericTests.cc b/src/drc/unit_tests/drcGenericTests.cc
index ceb96eb0d..3ff538d89 100644
--- a/src/drc/unit_tests/drcGenericTests.cc
+++ b/src/drc/unit_tests/drcGenericTests.cc
@@ -178,3 +178,13 @@ TEST(11d)
 {
   run_test (_this, "11", true);
 }
+
+TEST(12)
+{
+  run_test (_this, "12", false);
+}
+
+TEST(12d)
+{
+  run_test (_this, "12", true);
+}