vim-patch:8.1.0945: internal error when using pattern with NL in the range

Problem:    Internal error when using pattern with NL in the range.
Solution:   Use an actual newline for the range. (closes vim/vim#3989)  Also fix
            error message.  (Dominique Pelle)
a5483448cb

src/nvim/regexp_nfa.c

@@ -1692,7 +1692,8 @@ collection:
           MB_PTR_ADV(regparse);
 
           if (*regparse == 'n')
-            startc = reg_string ? NL : NFA_NEWL;
+            startc = (reg_string || emit_range || regparse[1] == '-')
+              ? NL : NFA_NEWL;
           else if  (*regparse == 'd'
                     || *regparse == 'o'
                     || *regparse == 'x'

src/nvim/testdir/test_regexp_latin.vim

@@ -30,3 +30,11 @@ func Test_equivalence_re2()
   set re=2
   call s:equivalence_test()
 endfunc
+
+func Test_range_with_newline()
+  new
+  call setline(1, "a")
+  call assert_equal(0, search("[ -*\\n- ]"))
+  call assert_equal(0, search("[ -*\\t-\\n]"))
+  bwipe!
+endfunc