unless necessary for formatting or code, use ' instead of ` Files affected: doc/interpreter/TODO, etc/HACKING.md, examples/code/oregonator.cc, examples/code/oregonator.m, libgui/graphics/ObjectFactory.cc, libinterp/corefcn/defun-dld.h, libinterp/corefcn/defun.h, libinterp/corefcn/graphics.cc, libinterp/corefcn/ls-hdf5.cc, libinterp/corefcn/oct-stream.cc, libinterp/octave-value/cdef-class.cc, libinterp/octave-value/cdef-manager.cc, libinterp/octave-value/cdef-method.cc, libinterp/octave-value/cdef-object.cc, libinterp/octave-value/cdef-package.cc, libinterp/octave-value/cdef-property.cc, libinterp/octave-value/cdef-utils.cc, libinterp/octave-value/ov-classdef.cc, libinterp/octave-value/ov-java.cc, libinterp/octave-value/ov.h, libinterp/parse-tree/oct-parse.yy, liboctave/array/Array.h, liboctave/numeric/bsxfun.h, liboctave/util/oct-rl-hist.c, scripts/help/__unimplemented__.m, scripts/image/imformats.m, scripts/image/imwrite.m, scripts/image/private/__imread__.m, scripts/image/private/__imwrite__.m, scripts/java/org/octave/Matrix.java, scripts/linear-algebra/condeig.m, scripts/miscellaneous/inputParser.m, scripts/miscellaneous/publish.m, scripts/pkg/private/configure_make.m, scripts/special-matrix/gallery.m, scripts/web/weboptions.m, test/classdef/classdef.tst.

--- a/libinterp/octave-value/cdef-utils.cc	Wed Jun 26 12:09:37 2019 -0400
+++ b/libinterp/octave-value/cdef-utils.cc	Wed Jun 26 15:47:03 2019 -0400
@@ -140,7 +140,7 @@
   to_cdef (const octave_value& val)
   {
     if (val.type_name () != "object")
-      error ("cannot convert `%s' into `object'", val.type_name().c_str ());
+      error ("cannot convert '%s' into 'object'", val.type_name().c_str ());
 
     return dynamic_cast<octave_classdef *> (val.internal_rep ())->get_object ();
   }
@@ -149,7 +149,7 @@
   to_cdef_ref (const octave_value& val)
   {
     if (val.type_name () != "object")
-      error ("cannot convert `%s' into `object'", val.type_name().c_str ());
+      error ("cannot convert '%s' into 'object'", val.type_name().c_str ());
 
     return dynamic_cast<octave_classdef *> (val.internal_rep ())->get_object_ref ();
   }
@@ -391,7 +391,7 @@
           }
       }
     else
-      error ("invalid property/method access in class `%s'",
+      error ("invalid property/method access in class '%s'",
              cls.get_name ().c_str ());
 
     return false;