RegexSet misbehave with unicode

[constituent]

Tested with regex 0.2.1

println!("{:?}", RegexSet::new(&["a", "b",]).unwrap().is_match("b"));
println!("{:?}", RegexSet::new(&["b", "a",]).unwrap().is_match("b"));
println!("{:?}", RegexSet::new(&["a", "β",]).unwrap().is_match("β"));
println!("{:?}", RegexSet::new(&["β", "a",]).unwrap().is_match("β"));

gives

true
true
false
true

The third should also be true. The only difference of b or β leads to different results.

[BurntSushi]

Interestingly, these work fine:

println!("{:?}", Regex::new("a|β").unwrap().is_match("β"));
println!("{:?}", Regex::new("β|a").unwrap().is_match("β"));

[BurntSushi]

Found the problem. There appears to be a bug in the compiler that's producing incorrect bytecode specifically for RegexSet:

0000 Split(1, 3) (start)
0001 Bytes(a, a)
0002 Match(0)
0003 Bytes(\xb2, \xb2) (goto: 5)
0004 Bytes(\xce, \xce) (goto: 3)
0005 Match(1)

The correct program should be:

0000 Split(1, 4) (start)
0001 Bytes(a, a)
0002 Match(0)
0003 Bytes(\xb2, \xb2) (goto: 5)
0004 Bytes(\xce, \xce) (goto: 3)
0005 Match(1)

My guess is that the extra Match instructions is somehow throwing things off, because a|β produces the correct program.

[constituent]

I've tested with my original issue and it also works fine now. Thanks!