Fix non-passing of mark values out of recursions.

ChangeLog

@@ -34,6 +34,8 @@ bugs were never in fully released code, but are noted here for the record.
   (d) Captures in negative assertions that were used as conditions were not
       happening if the assertion matched via (*ACCEPT).   
       
+  (e) Mark values were not being passed out of recursions. 
+      
 2. Now that pcre2_match() no longer uses recursive function calls (see above),
 the "match limit recursion" value seems misnamed. It still exists, and limits 
 the depth of tree that is searched. To avoid future confusion, it has been 

src/pcre2_match.c

@@ -725,7 +725,8 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
     where we know the starting frame is at the top of the chained frames, in
     this case we have to search back for the relevant frame in case other types
     of group that use chained frames have intervened. Multiple OP_CLOSEs always
-    come innermost first, which matches the chain order. */
+    come innermost first, which matches the chain order. We can ignore this in
+    a recursion, because captures are not passed out of recursions. */
 
     case OP_CLOSE:
     if (Fcurrent_recurse == RECURSE_UNSET)
@@ -746,23 +747,21 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
       Fovector[offset+1] = Feptr - mb->start_subject;
       if (offset >= Foffset_top) Foffset_top = offset + 2;
       }
-
     Fecode += PRIV(OP_lengths)[*Fecode];
     break;
 
 
     /* ===================================================================== */
-    /* End of the pattern, either real or forced. In an assertion ACCEPT,
+    /* Real or forced end of the pattern, assertion, or recursion. In an
-    update the last used pointer and remember the current frame so that the
+    assertion ACCEPT, update the last used pointer and remember the current
-    captures can be fished out of it. */
+    frame so that the captures can be fished out of it. */
 
     case OP_ASSERT_ACCEPT:
     if (Feptr > mb->last_used_ptr) mb->last_used_ptr = Feptr;
     assert_accept_frame = F;
     RRETURN(MATCH_ACCEPT);
 
-    /* The real end, or top-level (*ACCEPT). If recursing, we have to find the
+    /* If recursing, we have to find the most recent recursion. */
-    most recent recursion. */
 
     case OP_ACCEPT:
     case OP_END:
@@ -782,10 +781,11 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
         }
 
       /* N is now the frame of the recursion; the previous frame is at the
-      OP_RECURSE position. Go back there, copying the current subject position,
+      OP_RECURSE position. Go back there, copying the current subject position
-      and move on past the OP_RECURSE. */
+      and mark, and move on past the OP_RECURSE. */
 
       P->eptr = Feptr;
+      P->mark = Fmark;
       F = P;
       Fecode += 1 + LINK_SIZE;
       continue;
@@ -5078,10 +5078,7 @@ fprintf(stderr, "++ op=%d\n", *Fecode);
         }
       }
 
-    /* Now run the recursion. If it successfully completes, it re-instates the
+    /* Now run the recursion, branch by branch. */
-    previous values of the captures and continues, just like a non-capturing
-    bracket. We must leave Fecode unchanged so that the ending code can find
-    out where to continue. */
 
     Lstart_branch = bracode;
     Lframe_type = GF_RECURSE | number;

testdata/testinput2

@@ -5006,4 +5006,9 @@ a)"xI
 \= Expect no match
     abc
     
+# Perl gives no match for this one
+
+/(a(*MARK:m)(*ACCEPT)){0}(?1)/mark
+    abc
+
 # End of testinput2 

testdata/testoutput2

@@ -15530,6 +15530,13 @@ Callout 1: last capture = 1
     abc
 No match
     
+# Perl gives no match for this one
+
+/(a(*MARK:m)(*ACCEPT)){0}(?1)/mark
+    abc
+ 0: a
+MK: m
+
 # End of testinput2 
 Error -63: PCRE2_ERROR_BADDATA (unknown error number)
 Error -62: bad serialized data