Fix crash when more than one kind of "push" was set in pcre2test.

ChangeLog

@@ -153,6 +153,9 @@ tests to improve coverage.
 
 30. Implement (?n: for PCRE2_NO_AUTO_CAPTURE, because Perl now has this.
 
+31. If more than one of "push", "pushcopy", or "pushtablescopy" were set in 
+pcre2test, a crash could occur.
+
 
 Version 10.23 14-February-2017
 ------------------------------

src/pcre2test.c

@@ -721,12 +721,15 @@ the first control word. Note that CTL_POSIX_NOSUB is always accompanied by
 CTL_POSIX, so it doesn't need its own entries. */
 
 static uint32_t exclusive_pat_controls[] = {
-  CTL_POSIX  | CTL_HEXPAT,
-  CTL_POSIX  | CTL_PUSH,
-  CTL_POSIX  | CTL_PUSHCOPY,
-  CTL_POSIX  | CTL_PUSHTABLESCOPY,
-  CTL_POSIX  | CTL_USE_LENGTH,
-  CTL_EXPAND | CTL_HEXPAT };
+  CTL_POSIX    | CTL_HEXPAT,
+  CTL_POSIX    | CTL_PUSH,
+  CTL_POSIX    | CTL_PUSHCOPY,
+  CTL_POSIX    | CTL_PUSHTABLESCOPY,
+  CTL_POSIX    | CTL_USE_LENGTH,
+  CTL_PUSH     | CTL_PUSHCOPY,
+  CTL_PUSH     | CTL_PUSHTABLESCOPY,
+  CTL_PUSHCOPY | CTL_PUSHTABLESCOPY,   
+  CTL_EXPAND   | CTL_HEXPAT };
 
 /* Data controls that are mutually exclusive. At present these are all in the
 first control word. */

testdata/testinput20

@@ -97,4 +97,12 @@
 #pop
     abcd
 
+# Must only specify one of these
+
+//push,pushcopy
+
+//push,pushtablescopy
+
+//pushcopy,pushtablescopy
+
 # End of testinput20

testdata/testoutput20

@@ -147,4 +147,15 @@ Serialization failed: error -30: patterns do not all use the same character tabl
     abcd
  0: abcd
 
+# Must only specify one of these
+
+//push,pushcopy
+** Not allowed together: push pushcopy
+
+//push,pushtablescopy
+** Not allowed together: push pushtablescopy
+
+//pushcopy,pushtablescopy
+** Not allowed together: pushcopy pushtablescopy
+
 # End of testinput20