Microsoft has a complete list of supported and unsupported methods in Linq to Entities. That's where to go to find out this information.
In the case of LINQtoSQL / Entities, the queries are all broken down into expression trees which are then passed to the provider APIs. The providers cannot provide compile time information about the trees they do or do not support because there is no syntactic difference. The only choice is for them to provide runtime data.
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