Use <lamba> as the function name for lambdas (matches old compiler).
diff --git a/Python/compile.c b/Python/compile.c
index 47c57f4..a883f5f 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1961,7 +1961,7 @@
 	arguments_ty args = e->v.Lambda.args;
 	assert(e->kind == Lambda_kind);
 
-	name = PyString_InternFromString("lambda");
+	name = PyString_InternFromString("<lambda>");
 	if (!name)
 		return 0;