fix compilation error

internal/engine.cm

@@ -78,6 +78,7 @@ function load_pipeline_module(name, env) {
   var boot_par = null
   var boot_fld = null
   var boot_mc = null
+  var boot_sl = null
   var tok_result = null
   var ast = null
   var compiled = null
@@ -105,6 +106,8 @@ function load_pipeline_module(name, env) {
       }
       ast = boot_fld(ast)
       compiled = boot_mc(ast)
+      boot_sl = boot_load("streamline")
+      compiled = boot_sl(compiled)
       mcode_json = json.encode(compiled)
       mach_blob = mach_compile_mcode_bin(name, mcode_json)
       if (cached) {