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https://issues.apache.org/jira/browse/GROOVY-7996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17174369#comment-17174369
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Paul King commented on GROOVY-7996:
-----------------------------------

{{MopAwareChecker}} is just an idea - we'd need to work through the details. If 
we fix all of the type checker to be consistent with the GROOVY-7996 property 
handling, then any class with propertyMissing or methodMissing suddenly has a 
huge whole in its checking - basically any property or any method would be 
permitted. Some folks might not want to forgo that much checking. A type 
checking extension would allow it to be opt in - yes, currently it would need 
to be explicitly added in, e.g. {{@TypeChecked(extensions='MopAwareChecker')}}.

> Using with method with a closure that references a protected property 
> produces ClassCastException
> -------------------------------------------------------------------------------------------------
>
>                 Key: GROOVY-7996
>                 URL: https://issues.apache.org/jira/browse/GROOVY-7996
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.4.7
>            Reporter: Graeme Rocher
>            Priority: Major
>             Fix For: 2.5.9, 3.0.0-rc-2
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> The following example:
> {code}
> class Foo {
>     Object propertyMissing(String name) {
>          return "stuff"
>     }
>     
>     void build(Closure callable) {
>          this.with(callable)
>     }
> }
> @groovy.transform.CompileStatic
> class Bar {
>     protected List bar = []
>     
>     boolean doStuff() {
>         Foo foo = new Foo()
>         foo.build {
>            return bar.isEmpty() 
>         }
>     }
> }
> new Bar().doStuff()
> {code}
> Produces 
> {code}
> java.lang.ClassCastException: java.lang.String cannot be cast to 
> java.util.List
>       at Bar$_doStuff_closure1.doCall(ConsoleScript3:19)
>       at Bar$_doStuff_closure1.call(ConsoleScript3)
>       at 
> org.codehaus.groovy.runtime.DefaultGroovyMethods.with(DefaultGroovyMethods.java:242)
>       at Bar.doStuff(ConsoleScript3:18)
>       at Ba
> {code}
> The equivalent code without CompileStatic prints:
> {code}
> Result: false
> {code}
> The behaviour of both should be he same IMO



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