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 #3989)  Also fix
            error message.  (Dominique Pelle)

src/regexp_nfa.c

@@ -245,7 +245,7 @@ static int nfa_classcodes[] = {
 
 static char_u e_nul_found[] = N_("E865: (NFA) Regexp end encountered prematurely");
 static char_u e_misplaced[] = N_("E866: (NFA regexp) Misplaced %c");
-static char_u e_ill_char_class[] = N_("E877: (NFA regexp) Invalid character class: %ld");
+static char_u e_ill_char_class[] = N_("E877: (NFA regexp) Invalid character class: %d");
 
 // Variables only used in nfa_regcomp() and descendants.
 static int nfa_re_flags; // re_flags passed to nfa_regcomp()
@@ -1785,7 +1785,8 @@ 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'

src/testdir/test_regexp_latin.vim

@@ -122,3 +122,11 @@ func Test_rex_init()
   bwipe!
   set re=0
 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

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    945,
 /**/
     944,
 /**/