patch 8.2.2072: Vim9: list assign not well tested

Problem:    Vim9: list assign not well tested.
Solution:   Test with different destinations.  Fix white space error.

src/testdir/test_vim9_assign.vim

@@ -657,6 +657,24 @@ def Test_assignment_var_list()
       assert_equal(3, &ts)
       assert_equal(4, &sw)
       set ts=8 sw=4
+
+      [@a, @z] = ['aa', 'zz']
+      assert_equal('aa', @a)
+      assert_equal('zz', @z)
+
+      [$SOME_VAR, $OTHER_VAR] = ['some', 'other']
+      assert_equal('some', $SOME_VAR)
+      assert_equal('other', $OTHER_VAR)
+
+      [g:globalvar, s:scriptvar, b:bufvar, w:winvar, t:tabvar, v:errmsg] =
+            ['global', 'script', 'buf', 'win', 'tab', 'error']
+      assert_equal('global', g:globalvar)
+      assert_equal('script', s:scriptvar)
+      assert_equal('buf', b:bufvar)
+      assert_equal('win', w:winvar)
+      assert_equal('tab', t:tabvar)
+      assert_equal('error', v:errmsg)
+      unlet g:globalvar
   END
   CheckDefAndScriptSuccess(lines)
 enddef

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2072,
 /**/
     2071,
 /**/

src/vim9compile.c

@@ -5123,7 +5123,7 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
 	// can be something like "[1, 2]->func()"
 	return arg;
 
-    if (oplen > 0 && (!VIM_ISWHITE(*sp) || !VIM_ISWHITE(op[oplen])))
+    if (oplen > 0 && (!VIM_ISWHITE(*sp) || !IS_WHITE_OR_NUL(op[oplen])))
     {
 	error_white_both(op, oplen);
 	return NULL;
@@ -5159,10 +5159,16 @@ compile_assignment(char_u *arg, exarg_T *eap, cmdidx_T cmdidx, cctx_T *cctx)
     }
     else if (var_count > 0)
     {
+	char_u *wp;
+
 	// for "[var, var] = expr" evaluate the expression here, loop over the
 	// list of variables below.
+	// A line break may follow the "=".
 
-	p = skipwhite(op + oplen);
+	wp = op + oplen;
+	p = skipwhite(wp);
+	if (may_get_next_line(wp, &p, cctx) == FAIL)
+	    return FAIL;
 	if (compile_expr0(&p, cctx) == FAIL)
 	    return NULL;
 	end = p;