We can't print the AST or the source for stubs.

src/codegen.cc

Index: src/codegen.cc
diff --git a/src/codegen.cc b/src/codegen.cc
index 2eebef663cfcd8d2eb443f2d054b18a69f1db940..b42645cd006c83f2045eb931367c4d45ff5bb920 100644
--- a/src/codegen.cc
+++ b/src/codegen.cc
@@ -86,12 +86,12 @@ void CodeGenerator::MakeCodePrologue(CompilationInfo* info) {
     PrintF(" ***\n");
   }
 
-  if (print_source) {
+  if (!info->IsStub() && print_source) {
     PrintF("--- Source from AST ---\n%s\n",
            PrettyPrinter().PrintProgram(info->function()));
   }
 
-  if (print_ast) {
+  if (!info->IsStub() && print_ast) {
     PrintF("--- AST ---\n%s\n",
            AstPrinter().PrintProgram(info->function()));
   }