patch 8.0.0618: NFA regex engine handles [0-z] incorrectly

Problem:    NFA regex engine handles [0-z] incorrectly.
Solution:   Return at the right point. (James McCoy, closes #1703)

src/regexp_nfa.c

@@ -628,37 +628,39 @@ nfa_recognize_char_class(char_u *start, char_u *end, int extra_newl)
 			config |= CLASS_o9;
 			break;
 		    }
-		    else
 		    if (*(p + 2) == '7')
 		    {
 			config |= CLASS_o7;
 			break;
 		    }
+		    return FAIL;
+
 		case 'a':
 		    if (*(p + 2) == 'z')
 		    {
 			config |= CLASS_az;
 			break;
 		    }
-		    else
 		    if (*(p + 2) == 'f')
 		    {
 			config |= CLASS_af;
 			break;
 		    }
+		    return FAIL;
+
 		case 'A':
 		    if (*(p + 2) == 'Z')
 		    {
 			config |= CLASS_AZ;
 			break;
 		    }
-		    else
 		    if (*(p + 2) == 'F')
 		    {
 			config |= CLASS_AF;
 			break;
 		    }
-		/* FALLTHROUGH */
+		    return FAIL;
+
 		default:
 		    return FAIL;
 	    }

src/testdir/test36.in

@@ -98,9 +98,15 @@ p:s/\%#=2\U//g
 p:s/\%#=0[^A-Z]//g
 p:s/\%#=1[^A-Z]//g
 p:s/\%#=2[^A-Z]//g
-p:s/\%#=0\%204l^\t...//g
+p:s/\%#=0\%210l^\t...//g
-p:s/\%#=1\%205l^\t...//g
+p:s/\%#=1\%211l^\t...//g
-p:s/\%#=2\%206l^\t...//g
+p:s/\%#=2\%212l^\t...//g
+p:s/\%#=0[0-z]//g
+p:s/\%#=1[0-z]//g
+p:s/\%#=2[0-z]//g
+p:s/\%#=0[^0-z]//g
+p:s/\%#=1[^0-z]//g
+p:s/\%#=2[^0-z]//g
 :/^start-here/+1,$wq! test.out
 ENDTEST
 

src/testdir/test36.ok

@@ -97,3 +97,9 @@ ABCDEFGHIXYZ
 	
  !"#$%&'()#+'-./0123456789:;<=>?@[\]^_`{|}~<><7F><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 	
+ !"#$%&'()#+'-./0123456789:;<=>?@[\]^_`{|}~<><7F><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+	
+ !"#$%&'()#+'-./0123456789:;<=>?@[\]^_`{|}~<><7F><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
+ABCDEFGHIXYZabcdefghiwxyz
+ABCDEFGHIXYZabcdefghiwxyz
+ABCDEFGHIXYZabcdefghiwxyz

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    618,
 /**/
     617,
 /**/