Change By: Gunnar Morling (06/Mar/13 12:30 PM)
Description: We need to throw a {{ConstraintDefinitionException}} in case

*  a constraint is generic and cross-parameter but does not define a member {{validationAppliesTo()}}  and when
*  pure generic/cross-parameter constraints define such member .
* {{validationAppliesTo()}} has the wrong type
* {{validationAppliesTo()}} has the wrong default value

  See: 

{{InvalidConstraintDefinitionsTest#testGenericAndCrossParameterConstraintDefinesValidationAppliesTo()}}
{{InvalidConstraintDefinitionsTest#testCrossParameterConstraintWithValidationAppliesToCausesException()}}
{{InvalidConstraintDefinitionsTest#testGenericConstraintWithValidationAppliesToCausesException()}}
{{InvalidConstraintDefinitionsTest#testConstraintDefinitionWithWrongValidationAppliesToType()}}
{{InvalidConstraintDefinitionsTest#testConstraintDefinitionWithWrongDefaultValidationAppliesTo()}}
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