Closures that are not inside of a method (e.g. they are defined using @Field) and have explicit return statements cause an NPE during compilation
For Closures that are inside of a method and have explicit return statements, the sandbox transforms the return statement and inserts a checked cast to the return type of the surrounding method, which is incorrect
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Fixes #99
The code related to intercepting implicit Groovy casts in method return values in https://github.com/jenkinsci/groovy-sandbox/commit/520243213bcd8c81322e8e683daa8d555bb4f484 caused two related bugs for closure expressions with explicit return statements:
@Field) and have explicit return statements cause an NPE during compilation