accelerate: Ticket #40: liftAcc in CUDA.Execute doesn't handle Let and Let2
http://trac.haskell.org/accelerate/ticket/40
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When recovering sharing of computations involving <tt>scanl'</tt>, <tt>scanr'</tt>, etc whose results are used in <tt>size</tt>, <tt>shape</tt>, or <tt>(!)</tt> functions, let-bindings may be encountered by <tt>D.A.A.CUDA.Execute.liftAcc</tt>, which panics as it currently doesn't handle <tt>Let</tt> and <tt>Let2</tt> AST nodes.
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http://trac.haskell.org/accelerate/ticket/40
Trac 0.11.1