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Help using Compile with Solve


I want to create a compiled function that uses Solve, like this

(IN)
t1=Compile[{x,y},Solve[x+y==z,z]]

(OUT)
CompiledFunction[{x, y}, Solve[x + y == z, z], -CompiledCode-]

(IN)
t1[1,1]

(OUT)
CompiledFunction::ccr: 
   Expression z should be a machine-size real number.
CompiledFunction::cfex: 
   External evaluation error at instruction 5; proceeding with
     uncompiled evaluation.

{{z -> 2}}


As you can see, this doesn't work as a compiled function.  
It seems like I need to tell Compile that z is also real, but 
I'm not sure how to do that.

Thanks, Bill


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