Add isExprOf and toExprOf to allow safe expression casting
#10204
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Currently we can only call `asExprOf` but have no simple way to check that the expression is in fact of some type.
liufengyun
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Nov 6, 2020
nicolasstucki
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Currently we can only call
asExprOfbut have no simple way to check thatthe expression is in fact of some type.