Fix false negative in token conflict detection

Co-Authored-By: Timothy Clem <timothy.clem@gmail.com>

cli/src/generate/build_tables/token_conflicts.rs

@@ -1,9 +1,9 @@
-use crate::generate::build_tables::item::{TokenSetDisplay};
+use crate::generate::build_tables::item::TokenSetDisplay;
 use crate::generate::grammars::{LexicalGrammar, SyntaxGrammar};
 use crate::generate::nfa::{CharacterSet, NfaCursor, NfaTransition};
 use crate::generate::rules::TokenSet;
-use std::collections::HashSet;
 use std::cmp::Ordering;
+use std::collections::HashSet;
 use std::fmt;
 
 #[derive(Clone, Debug, Default, PartialEq, Eq)]

cli/src/generate/nfa.rs

@@ -266,6 +266,13 @@ fn compare_chars(left: &Vec<char>, right: &Vec<char>) -> SetComparision {
             result.common = true;
         }
     }
+
+    match (i, j) {
+        (Some(_), _) => result.left_only = true,
+        (_, Some(_)) => result.right_only = true,
+        _ => {}
+    }
+
     result
 }
 
@@ -810,5 +817,12 @@ mod tests {
         );
         assert!(a.does_intersect(&b));
         assert!(b.does_intersect(&a));
+
+        let (a, b) = (
+            CharacterSet::Include(vec!['c']),
+            CharacterSet::Exclude(vec!['a']),
+        );
+        assert!(a.does_intersect(&b));
+        assert!(b.does_intersect(&a));
     }
 }