About polish the generics type syntax for closure

[Daniel Sun]

Hi all

       I've been developing a project with Groovy 3. When I try to specify
the generics type for closure, I have to use annotation..., which is quite
verbose... e.g.
```
public <V> V withSql(@ClosureParams(value= SimpleType.class,
options="groovy.sql.Sql") Closure<V> closure)
```

       I propose make the above code groovier, e.g.
```
public <V> V withSql(Closure<groovy.sql.Sql -> V> closure)
```

       Any thoughts?


Cheers,
Daniel.Sun



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