Definition of recursive even fails in pattern match failure

[kmels]

To reproduce:

cd src
ghc -prof -fprof-auto -rtsopts Main.hs
/Main -f ../examples/interpreter/RecursiveVdefg.hs -e even +RTS -p

output:

Main: user error (Pattern match failure in do expression at Language/Core/Interpreter/Evaluable.hs:56:9-30)

[kmels]

Fixed in dd12c73