patch 8.2.3099: Vim9: missing catch/finally not reported at script level

Problem:    Vim9: missing catch/finally not reported at script level.
Solution:   Give an error. (closes #8487)

src/ex_eval.c

@@ -1670,6 +1670,8 @@ ex_catch(exarg_T *eap)
 	for (idx = cstack->cs_idx; idx > 0; --idx)
 	    if (cstack->cs_flags[idx] & CSF_TRY)
 		break;
+	if (cstack->cs_flags[idx] & CSF_TRY)
+	    cstack->cs_flags[idx] |= CSF_CATCH;
 	if (cstack->cs_flags[idx] & CSF_FINALLY)
 	{
 	    // Give up for a ":catch" after ":finally" and ignore it.
@@ -1963,8 +1965,8 @@ ex_endtry(exarg_T *eap)
 	 * made inactive by a ":continue", ":break", ":return", or ":finish" in
 	 * the finally clause.  The latter case need not be tested since then
 	 * anything pending has already been discarded. */
-	skip = did_emsg || got_int || did_throw ||
+	skip = did_emsg || got_int || did_throw
-	    !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
+			     || !(cstack->cs_flags[cstack->cs_idx] & CSF_TRUE);
 
 	if (!(cstack->cs_flags[cstack->cs_idx] & CSF_TRY))
 	{
@@ -1992,6 +1994,14 @@ ex_endtry(exarg_T *eap)
 	{
 	    idx = cstack->cs_idx;
 
+	    if (in_vim9script()
+		     && (cstack->cs_flags[idx] & (CSF_CATCH|CSF_FINALLY)) == 0)
+	    {
+		// try/endtry without any catch or finally: give an error and
+		// continue.
+		eap->errmsg = _(e_missing_catch_or_finally);
+	    }
+
 	    /*
 	     * If we stopped with the exception currently being thrown at this
 	     * try conditional since we didn't know that it doesn't have

src/structs.h

@@ -936,13 +936,14 @@ typedef struct {
 
 # define CSF_TRY	0x0100	// is a ":try"
 # define CSF_FINALLY	0x0200	// ":finally" has been passed
-# define CSF_THROWN	0x0400	// exception thrown to this try conditional
+# define CSF_CATCH	0x0400	// ":catch" has been seen
-# define CSF_CAUGHT	0x0800  // exception caught by this try conditional
+# define CSF_THROWN	0x0800	// exception thrown to this try conditional
-# define CSF_SILENT	0x1000	// "emsg_silent" reset by ":try"
+# define CSF_CAUGHT	0x1000  // exception caught by this try conditional
+# define CSF_SILENT	0x2000	// "emsg_silent" reset by ":try"
 // Note that CSF_ELSE is only used when CSF_TRY and CSF_WHILE are unset
 // (an ":if"), and CSF_SILENT is only used when CSF_TRY is set.
 //
-#define CSF_FUNC_DEF	0x2000	// a function was defined in this block
+#define CSF_FUNC_DEF	0x4000	// a function was defined in this block
 
 /*
  * What's pending for being reactivated at the ":endtry" of this try

src/testdir/test_vim9_script.vim

@@ -603,6 +603,15 @@ def Test_try_catch_throw()
   CheckScriptSuccess(lines)
   assert_match('E808: Number or Float required', g:caught)
   unlet g:caught
+
+  # missing catch and/or finally
+  lines =<< trim END
+      vim9script
+      try
+        echo 'something'
+      endtry
+  END
+  CheckScriptFailure(lines, 'E1032:')
 enddef
 
 def Test_try_in_catch()

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3099,
 /**/
     3098,
 /**/