jsTailcall :: JS -> JS
jsTailcall call =
  jsCall (idrRTNamespace ++ "tailcall") [
    JSFunction [] (JSReturn call)
  ]
jsTailcall :: JS -> JS
jsTailcall call =
  jsCall (idrRTNamespace ++ "tailcall") [
    JSFunction [] (JSReturn call)
  ]
jsTailcall call =
  jsCall (idrRTNamespace ++ "tailcall") [
    JSFunction [] (JSReturn call)
  ]