just return toplevel symbol table rather than all blocks (closes #19393)
diff --git a/Lib/symtable.py b/Lib/symtable.py
index 39c1a80..bb27196 100644
--- a/Lib/symtable.py
+++ b/Lib/symtable.py
@@ -10,10 +10,7 @@
 __all__ = ["symtable", "SymbolTable", "Class", "Function", "Symbol"]
 
 def symtable(code, filename, compile_type):
-    raw = _symtable.symtable(code, filename, compile_type)
-    for top in raw.values():
-        if top.name == 'top':
-            break
+    top = _symtable.symtable(code, filename, compile_type)
     return _newSymbolTable(top, filename)
 
 class SymbolTableFactory: