diff --git a/7.3.637 b/7.3.637
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+To: vim_dev@googlegroups.com
+Subject: Patch 7.3.637
+Fcc: outbox
+From: Bram Moolenaar <Bram@moolenaar.net>
+Mime-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+------------
+
+Patch 7.3.637
+Problem:    Cannot catch the error caused by a foldopen when there is no fold.
+	    (ZyX, Issue 48)
+Solution:   Do not break out of the loop early when inside try/catch.
+	    (Christian Brabandt) Except when there is a syntax error.
+Files:	    src/ex_docmd.c, src/globals.h
+
+
+*** ../vim-7.3.636/src/ex_docmd.c	2012-08-15 14:04:50.000000000 +0200
+--- src/ex_docmd.c	2012-08-23 18:39:08.000000000 +0200
+***************
+*** 1295,1301 ****
+  		&& cstack.cs_trylevel == 0
+  #endif
+  	    )
+! 	    && !(did_emsg && used_getline
+  			    && (getline_equal(fgetline, cookie, getexmodeline)
+  			       || getline_equal(fgetline, cookie, getexline)))
+  	    && (next_cmdline != NULL
+--- 1295,1308 ----
+  		&& cstack.cs_trylevel == 0
+  #endif
+  	    )
+! 	    && !(did_emsg
+! #ifdef FEAT_EVAL
+! 		/* Keep going when inside try/catch, so that the error can be
+! 		 * dealth with, except when it is a syntax error, it may cause
+! 		 * the :endtry to be missed. */
+! 		&& (cstack.cs_trylevel == 0 || did_emsg_syntax)
+! #endif
+! 		&& used_getline
+  			    && (getline_equal(fgetline, cookie, getexmodeline)
+  			       || getline_equal(fgetline, cookie, getexline)))
+  	    && (next_cmdline != NULL
+***************
+*** 1305,1310 ****
+--- 1312,1318 ----
+  			|| (flags & DOCMD_REPEAT)));
+  
+      vim_free(cmdline_copy);
++     did_emsg_syntax = FALSE;
+  #ifdef FEAT_EVAL
+      free_cmdlines(&lines_ga);
+      ga_clear(&lines_ga);
+***************
+*** 2137,2142 ****
+--- 2145,2151 ----
+  	    if (!sourcing)
+  		append_command(*cmdlinep);
+  	    errormsg = IObuff;
++ 	    did_emsg_syntax = TRUE;
+  	}
+  	goto doend;
+      }
+*** ../vim-7.3.636/src/globals.h	2012-07-10 16:49:08.000000000 +0200
+--- src/globals.h	2012-08-23 18:29:09.000000000 +0200
+***************
+*** 183,188 ****
+--- 183,190 ----
+  #endif
+  EXTERN int	did_emsg;		    /* set by emsg() when the message
+  					       is displayed or thrown */
++ EXTERN int	did_emsg_syntax;	    /* did_emsg set because of a
++ 					       syntax error */
+  EXTERN int	called_emsg;		    /* always set by emsg() */
+  EXTERN int	ex_exitval INIT(= 0);	    /* exit value for ex mode */
+  EXTERN int	emsg_on_display INIT(= FALSE);	/* there is an error message */
+*** ../vim-7.3.636/src/version.c	2012-08-23 15:53:00.000000000 +0200
+--- src/version.c	2012-08-23 17:59:12.000000000 +0200
+***************
+*** 721,722 ****
+--- 721,724 ----
+  {   /* Add new patch number below this line */
++ /**/
++     637,
+  /**/
+
+-- 
+GOD: That is your purpose Arthur ... the Quest for the Holy Grail ...
+                 "Monty Python and the Holy Grail" PYTHON (MONTY) PICTURES LTD
+
+ /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
+///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
+\\\  an exciting new programming language -- http://www.Zimbu.org        ///
+ \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///