returns the result of interpreting the object as an instance of ` snapshot ' . this implementation returns null ; returning a non-null result will terminate the switch . concode_field_sep ExpressionsPackage modelPackage concode_field_sep T caseCommit concode_elem_sep T caseAll concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T doSwitch concode_elem_sep T caseTypedElement concode_elem_sep T caseExpression concode_elem_sep T caseObjectBasedExpression concode_elem_sep T caseInScope concode_elem_sep T defaultCase
T function ( Snapshot arg0 ) { return null ; }