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/parse-tree/oct-parse.yy	Wed Jun 26 12:09:37 2019 -0400
+++ b/libinterp/parse-tree/oct-parse.yy	Wed Jun 26 15:47:03 2019 -0400
@@ -3787,7 +3787,7 @@
         // Methods that cannot be declared outside the classdef file:
         // - methods with '.' character (e.g. property accessors)
         // - class constructor
-        // - `delete'
+        // - 'delete'
 
         if (mname.find_first_of (".") == std::string::npos
             && mname != "delete"
@@ -3807,7 +3807,7 @@
           }
         else
           bison_error ("invalid external method declaration, an external "
-                       "method cannot be the class constructor, `delete' "
+                       "method cannot be the class constructor, 'delete' "
                        "or have a dot (.) character in its name");
       }
     else