patch 8.2.1499: Vim9: error when using "$" with col()

Problem:    Vim9: error when using "$" with col().
Solution:   Reorder getting the column value. (closes #6744)

src/eval.c

@@ -4841,19 +4841,23 @@ var2fpos(
 	pos.lnum = list_find_nr(l, 0L, &error);
 	if (error || pos.lnum <= 0 || pos.lnum > curbuf->b_ml.ml_line_count)
 	    return NULL;	// invalid line number
-
-	// Get the column number
-	pos.col = list_find_nr(l, 1L, &error);
-	if (error)
-	    return NULL;
 	len = (long)STRLEN(ml_get(pos.lnum));
 
+	// Get the column number
 	// We accept "$" for the column number: last column.
 	li = list_find(l, 1L);
 	if (li != NULL && li->li_tv.v_type == VAR_STRING
 		&& li->li_tv.vval.v_string != NULL
 		&& STRCMP(li->li_tv.vval.v_string, "$") == 0)
+	{
 	    pos.col = len + 1;
+	}
+	else
+	{
+	    pos.col = list_find_nr(l, 1L, &error);
+	    if (error)
+		return NULL;
+	}
 
 	// Accept a position up to the NUL after the line.
 	if (pos.col == 0 || (int)pos.col > len + 1)

src/testdir/test_vim9_func.vim

@@ -1320,6 +1320,12 @@ def Test_bufnr()
   assert_equal(buf, bufnr('%'))
 enddef
 
+def Test_col()
+  new
+  setline(1, 'asdf')
+  assert_equal(5, col([1, '$']))
+enddef
+
 def Test_getreg_return_type()
   let s1: string = getreg('"')
   let s2: string = getreg('"', 1)

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1499,
 /**/
     1498,
 /**/