no need to use stream API

Author: turbolent

src/main/java/com/turbolent/regex/patterns/Alternation.java

@@ -126,7 +126,7 @@ public int hashCode() {
                           Arrays.stream(otherPatterns)
                                 .flatMap(Alternation::flatten))
                   .collect(orderedSetCollector());
-        patterns.stream().forEach(Objects::requireNonNull);
+        patterns.forEach(Objects::requireNonNull);
         return new Alternation<>(new ArrayList<>(patterns));
     }
 }

src/main/java/com/turbolent/regex/patterns/Concatenation.java

@@ -116,7 +116,7 @@ public int hashCode() {
                           Arrays.stream(otherPatterns)
                                 .flatMap(Concatenation::flatten))
                   .collect(Collectors.toList());
-        patterns.stream().forEach(Objects::requireNonNull);
+        patterns.forEach(Objects::requireNonNull);
         return new Concatenation<>(patterns);
     }
 }