There is no Clone() method if that's what you're asking. You can effectively copy a MethodDefinition (or any other *Definition for that matter) by creating a new object instance, and setting the new object's properties to the same values as the original object. In case of a MethodDefinition, this involves the method name, return type, declaring type, parameters, generic parameters, HasThis, ExplicitThis, etc.
Is there a quick and easy way to copy a MethodDefinition?
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Le doute n'est pas une condition agréable, mais la certitude est absurde.