--- a/etc/NEWS.6	Fri Feb 28 07:08:14 2020 +0100
+++ b/etc/NEWS.6	Sun Mar 08 17:54:55 2020 -0400
@@ -158,6 +158,12 @@
   outputs) as well as the orientation of all outputs to match Matlab
   releases prior to R2012b.
 
+- The function `streamtube` is Matlab compatible and plots tubes along
+  streamlines which are scaled by the vector field divergence. The
+  Octave-only extension `ostreamtube` can be used to visualize the flow
+  expansion and contraction of the vector field due to the local
+  crossflow divergence.
+
 - The interpreter now supports handles to nested functions.
 
 - The graphics properties `"LineWidth"` and `"MarkerSize"` are now

--- a/libinterp/corefcn/sparse-xpow.cc	Fri Feb 28 07:08:14 2020 +0100
+++ b/libinterp/corefcn/sparse-xpow.cc	Sun Mar 08 17:54:55 2020 -0400
@@ -67,7 +67,7 @@
   if (nr == 0 || nc == 0 || nr != nc)
     error ("for A^b, A must be a square matrix.  Use .^ for elementwise power.");
 
-  if (static_cast<int> (b) != b)
+  if (! xisint (b))
     error ("use full(a) ^ full(b)");
 
   int btmp = static_cast<int> (b);
@@ -135,7 +135,7 @@
   if (nr == 0 || nc == 0 || nr != nc)
     error ("for A^b, A must be a square matrix.  Use .^ for elementwise power.");
 
-  if (static_cast<int> (b) != b)
+  if (! xisint (b))
     error ("use full(a) ^ full(b)");
 
   int btmp = static_cast<int> (b);
@@ -329,7 +329,7 @@
       octave_idx_type nr = a.rows ();
       octave_idx_type nc = a.cols ();
 
-      if (static_cast<int> (b) != b && a.any_element_is_negative ())
+      if (! xisint (b) && a.any_element_is_negative ())
         {
           ComplexMatrix result (nr, nc, Complex (std::pow (0.0, b)));
 
@@ -363,7 +363,7 @@
           retval = octave_value (result);
         }
     }
-  else if (static_cast<int> (b) != b && a.any_element_is_negative ())
+  else if (! xisint (b) && a.any_element_is_negative ())
     {
       SparseComplexMatrix result (a);
 
@@ -427,7 +427,7 @@
         if (a.data(i) < 0.0)
           {
             double btmp = b (a.ridx (i), j);
-            if (static_cast<int> (btmp) != btmp)
+            if (! xisint (btmp))
               {
                 convert_to_complex = 1;
                 goto done;

--- a/libinterp/parse-tree/oct-parse.yy	Fri Feb 28 07:08:14 2020 +0100
+++ b/libinterp/parse-tree/oct-parse.yy	Sun Mar 08 17:54:55 2020 -0400
@@ -4561,6 +4561,13 @@
     if (m_lexer.m_reading_fcn_file || m_lexer.m_reading_script_file
         || m_lexer.m_reading_classdef_file)
       curr_line = get_file_line (m_lexer.m_fcn_file_full_name, err_line);
+    else
+      curr_line = m_lexer.m_current_input_line;
+
+    // Adjust the error column for display because it is 1-based in the
+    // lexer for easier reporting and it has already been advanced to
+    // one past the end of the most recently read token.
+    err_col -= 2;
 
     if (! curr_line.empty ())
       {