src/java.base/share/classes/jdk/internal/module/ModuleReferenceImpl.java

*** 161,169 ****
                  && Objects.equals(this.patcher, that.patcher);
      }
  
      @Override
      public String toString() {
!         return super.toString();
      }
  
  }
--- 161,176 ----
                  && Objects.equals(this.patcher, that.patcher);
      }
  
      @Override
      public String toString() {
!         StringBuilder sb = new StringBuilder();
!         sb.append("[module ");
!         sb.append(descriptor().name());
!         sb.append(", location=");
!         sb.append(location().orElseThrow(() -> new InternalError()));
!         if (isPatched()) sb.append(" (patched)");
!         sb.append("]");
!         return sb.toString();
      }
  
  }