User can add (a single) beans{} DSL declaration (see GroovyBeanDefinitionReader
in Spring 4 for more detail) anywhere at the top level of an application source
file. It will be compiled to a closure and fed in to the application context
through a GroovyBeanDefinitionReader. Cool!
The example spring-boot-cli/samples/beans.groovy runs in an integration test
and passes (see SampleIntegrationTests).
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