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Experimental Denotes that the annotated element is a marker of an experimental API. 
UseExperimental Allows use of an experimental API denoted by the given markers in the annotated file, declaration, or expression. 


Experimental.Level Severity of the diagnostic that should be reported on usages of experimental API which did not explicitly accept the experimental aspect of that API either by using UseExperimental or by being annotated with the corresponding marker annotation.