Please support builder DSLs that leverage the availability of lambdas

[joshlong]

Spring Framework 5 assumes Java 8 and supports Kotlin, in addition to Groovy. All 3 languages are lambda capable. It would be nice if we could have a configuration DSL that supports context, something like

http.httpBasic ( options -> ... ) ; 

or even

http
  .httpBasic ( o -> ) 
  .csr( ... ) 
  .pathMatchers ( config -> .. ) 
  ..

[rwinch]

Closing this in favor of gh-5557