Groovy
From APIDesign
What I envy Groovy users is Groovy's support for AST transformations. This is basically the same thing that project Lombok does to Java, however it is not just a set of few hardcoded annotations, it is general purpose system that allows everyone to easily define such annotations and their compile time AnnotationProcessors (read Groovy AST Transformation by Example for simple introduction).
Will Java ever woke up from its last two/three years stagnation?
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