Fix dis.dis to prints inner constant codes like CPython

bytecode/src/bytecode.rs

@@ -488,7 +488,17 @@ impl CodeObject {
 
 impl fmt::Display for CodeObject {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        self.display_inner(f, false, 1)
+        self.display_inner(f, false, 1)?;
+        for constant in self.get_constants() {
+            match constant {
+                Constant::Code { code } => {
+                    write!(f, "\nDisassembly of {}\n", constant)?;
+                    code.fmt(f)?;
+                }
+                _ => continue,
+            }
+        }
+        Ok(())
     }
 }
 

compiler/src/compile.rs

@@ -1188,6 +1188,7 @@ impl<O: OutputStream> Compiler<O> {
     }
 
     fn store_docstring(&mut self, doc_str: Option<String>) {
+        // TODO: __doc__ must be default None and no bytecodes unless it is Some
         // Duplicate top of stack (the function or class object)
         self.emit(Instruction::Duplicate);
 

vm/src/builtins.rs

@@ -831,7 +831,7 @@ mod decl {
             } else if !objtype::issubclass(&metaclass, &base_class) {
                 return Err(vm.new_type_error(
                     "metaclass conflict: the metaclass of a derived class must be a (non-strict) \
-                 subclass of the metaclasses of all its bases"
+                     subclass of the metaclasses of all its bases"
                         .to_owned(),
                 ));
             }

vm/src/stdlib/dis.rs

@@ -20,7 +20,7 @@ mod decl {
             vm.compile(
                 co_str.borrow_value(),
                 compile::Mode::Exec,
-                "<string>".to_owned(),
+                "<dis>".to_owned(),
             )
             .map_err(|err| vm.new_syntax_error(&err))?
             .into_object()