patch 8.2.0542: no test for E386

Problem:    No test for E386.
Solution:   Add a test. (Dominique Pelle, closes #5911)

src/testdir/test_search.vim

@@ -1402,6 +1402,11 @@ func Test_search_errors()
   call assert_fails("call search('pat', 'b', 1, [])", 'E745:')
   call assert_fails("call search('pat', 'ns')", 'E475:')
   call assert_fails("call search('pat', 'mr')", 'E475:')
+
+  new
+  call setline(1, ['foo', 'bar'])
+  call assert_fails('call feedkeys("/foo/;/bar/;\<CR>", "tx")', 'E386:')
+  bwipe!
 endfunc
 
 func Test_search_display_pattern()

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    542,
 /**/
     541,
 /**/