patch 8.2.1455: Vim9: crash when using typecast before constant

Problem:    Vim9: crash when using typecast before constant.
Solution:   Generate constant before checking type.  Add tets.
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index fb07586..38a3326 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1324,6 +1324,12 @@
 def Test_expr7t()
   let ls: list<string> = ['a', <string>g:string_empty]
   let ln: list<number> = [<number>g:anint, <number>g:alsoint]
+  let nr = <number>234
+  assert_equal(234, nr)
+
+  call CheckDefFailure(["let x = <nr>123"], 'E1010:')
+  call CheckDefFailure(["let x = <number >123"], 'E1068:')
+  call CheckDefFailure(["let x = <number 123"], 'E1104:')
 enddef
 
 " test low level expression
diff --git a/src/version.c b/src/version.c
index e6d929e..e873a9c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1455,
+/**/
     1454,
 /**/
     1453,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 5c4547d..9206284 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -3501,11 +3501,12 @@
     if (want_type != NULL)
     {
 	garray_T    *stack = &cctx->ctx_type_stack;
-	type_T	    *actual = ((type_T **)stack->ga_data)[stack->ga_len - 1];
+	type_T	    *actual;
 
+	generate_ppconst(cctx, ppconst);
+	actual = ((type_T **)stack->ga_data)[stack->ga_len - 1];
 	if (check_type(want_type, actual, FALSE) == FAIL)
 	{
-	    generate_ppconst(cctx, ppconst);
 	    if (need_type(actual, want_type, -1, cctx, FALSE) == FAIL)
 		return FAIL;
 	}
@@ -5016,6 +5017,7 @@
 		goto theend;
 	    if (*skipwhite(p) != ']')
 	    {
+		// this should not happen
 		emsg(_(e_missbrac));
 		goto theend;
 	    }