Question: Double integration with fsolve as a limit on the inner integral

Hello, I want to evaluate a double integral with fsolve as a limit. A simplified version of the problem is:

f:=(r,z)->r+z;

evalf(Int(Int(1,rbar=0..fsolve(f(r,z)=1,r)),z=0..1);

I've tried several variations of unapply and '...' but get the error:

Error, (in fsolve) z is in the equation, and is not solved for

 

I'd appreciate your advice!

 

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