Description
There are many times I find myself having to cast variables directly inside an instanceof Class check.
In addition, I have found a specific problem with a generic <T extends SomeClass> where a method in the class that returns T, Groovy believes a collection is being returned. This is the line in question: https://github.com/grails/gorm-graphql/blob/ea6887bef0ced75d9cc0d01dc7b94d4fc0520266/core/src/main/groovy/org/grails/gorm/graphql/fetcher/impl/EntityDataFetcher.groovy#L45
The goal of this issue is to have the following codebase compile without changes.
git clone -b broken_compilation https://github.com/grails/gorm-graphql
Attempt to compile with ./gradlew clean classes
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Issue Links
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GROOVY-8336 Static compilation requires casting inside instanceof check (additional cases)
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