Improper constructor name on Groovy class after copy-and-paste

Consider this Groovy class:

```groovy
package test36

class Test36 {
  Test36() {}
}
```

Now, copy and paste it, to create `Test36b`: the result is:

```groovy
package test36

class Test36b {
  Test36() {}
}
```

This class does not compile, of course, because the constructor hasn't been renamed.