account for comment delimiters in strings

src/lex.rs

@@ -143,6 +143,10 @@ fn process(document: &String) -> Result<Box<Seg>, String> {
                 }
                 // eat the whole line
                 '#' | ';'  => {
+                    if is_str {
+                        token.push(c);
+                        continue;
+                    }
                     ign = true;
                     delim_stack.push('\n');
                 }

tests/test_lex.rs

@@ -32,6 +32,12 @@ mod lex_tests {
         assert_eq!(lex(&document).unwrap().to_string(), document);
     }
 
+    #[test]
+    fn test_comment_delim_in_str() {
+        let document = String::from("('#')");
+        assert_eq!(lex(&document).unwrap().to_string(), document);
+    }
+
     #[test]
     fn test_empty_string() {
         let document = String::from("('')");