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The document discusses new features in Groovy 1.6, including performance improvements, syntax enhancements, compile-time metaprogramming, the Grape module system, Swing-related improvements, runtime metaprogramming additions, and OSGi readiness. Some key new features highlighted are multiple variable assignment, optional return in if/else and try/catch blocks, annotation definitions, AST transformations using annotations like @Singleton and @Immutable, and the @Grab annotation for declaring dependencies.











































