patch 8.2.1230: Vim9: list index error not caught by try/catch

Problem:    Vim9: list index error not caught by try/catch.
Solution:   Do not bail out if an error is inside try/catch. (closes #6462)

src/testdir/test_vim9_script.vim

@@ -509,6 +509,43 @@ def Test_try_catch()
     add(l, '3')
   endtry # comment
   assert_equal(['1', 'wrong', '3'], l)
+
+  let n: number
+  try
+    n = l[3]
+  catch /E684:/
+    n = 99
+  endtry
+  assert_equal(99, n)
+
+  try
+    n = g:astring[3]
+  catch /E714:/
+    n = 77
+  endtry
+  assert_equal(77, n)
+
+  try
+    n = l[g:astring]
+  catch /E39:/
+    n = 77
+  endtry
+  assert_equal(77, n)
+
+  try
+    n = s:does_not_exist
+  catch /E121:/
+    n = 121
+  endtry
+  assert_equal(121, n)
+
+  let d = #{one: 1}
+  try
+    n = d[g:astring]
+  catch /E716:/
+    n = 222
+  endtry
+  assert_equal(222, n)
 enddef
 
 def ThrowFromDef()

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1230,
 /**/
     1229,
 /**/

src/vim9execute.c

@@ -1065,6 +1065,8 @@ call_def_function(
 		    if (di == NULL)
 		    {
 			semsg(_(e_undefvar), name);
+			if (trylevel > 0)
+			    continue;
 			goto failed;
 		    }
 		    else
@@ -1786,6 +1788,7 @@ call_def_function(
 
 			--trystack->ga_len;
 			--trylevel;
+			ectx.ec_in_catch = FALSE;
 			trycmd = ((trycmd_T *)trystack->ga_data)
 							    + trystack->ga_len;
 			if (trycmd->tcd_caught && current_exception != NULL)
@@ -2084,7 +2087,10 @@ call_def_function(
 			    case EXPR_DIV:  f1 = f1 / f2; break;
 			    case EXPR_SUB:  f1 = f1 - f2; break;
 			    case EXPR_ADD:  f1 = f1 + f2; break;
-			    default: emsg(_(e_modulus)); goto failed;
+			    default: emsg(_(e_modulus));
+				     if (trylevel > 0)
+					 continue;
+				     goto failed;
 			}
 			clear_tv(tv1);
 			clear_tv(tv2);
@@ -2138,6 +2144,8 @@ call_def_function(
 		    if (tv->v_type != VAR_LIST)
 		    {
 			emsg(_(e_listreq));
+			if (trylevel > 0)
+			    continue;
 			goto failed;
 		    }
 		    list = tv->vval.v_list;
@@ -2146,6 +2154,8 @@ call_def_function(
 		    if (tv->v_type != VAR_NUMBER)
 		    {
 			emsg(_(e_number_exp));
+			if (trylevel > 0)
+			    continue;
 			goto failed;
 		    }
 		    n = tv->vval.v_number;
@@ -2153,11 +2163,13 @@ call_def_function(
 		    if ((li = list_find(list, n)) == NULL)
 		    {
 			semsg(_(e_listidx), n);
+			if (trylevel > 0)
+			    continue;
 			goto failed;
 		    }
 		    --ectx.ec_stack.ga_len;
 		    // Clear the list after getting the item, to avoid that it
-		    // make the item invalid.
+		    // makes the item invalid.
 		    tv = STACK_TV_BOT(-1);
 		    temp_tv = *tv;
 		    copy_tv(&li->li_tv, tv);
@@ -2226,6 +2238,8 @@ call_def_function(
 		    if ((di = dict_find(dict, key, -1)) == NULL)
 		    {
 			semsg(_(e_dictkey), key);
+			if (trylevel > 0)
+			    continue;
 			goto failed;
 		    }
 		    clear_tv(tv);