Fix to permit :input items to be code literals (pushed to :exec).
Fix to permit :input items to be code literals (pushed to :exec).

saulshanabrook/Clojush,Vaguery/Clojush,Vaguery/Clojush,saulshanabrook/Clojush,lspector/Clojush,NicMcPhee/Clojush,thelmuth/Clojush,lspector/Clojush,NicMcPhee/Clojush,thelmuth/Clojush