Index: lldb/include/lldb/Interpreter/CommandReturnObject.h
===================================================================
--- lldb/include/lldb/Interpreter/CommandReturnObject.h
+++ lldb/include/lldb/Interpreter/CommandReturnObject.h
@@ -63,20 +63,28 @@
   }
 
   void SetImmediateOutputFile(lldb::FileSP file_sp) {
+    if (m_hermetic)
+      return;
     lldb::StreamSP stream_sp(new StreamFile(file_sp));
     m_out_stream.SetStreamAtIndex(eImmediateStreamIndex, stream_sp);
   }
 
   void SetImmediateErrorFile(lldb::FileSP file_sp) {
+    if (m_hermetic)
+      return;
     lldb::StreamSP stream_sp(new StreamFile(file_sp));
     m_err_stream.SetStreamAtIndex(eImmediateStreamIndex, stream_sp);
   }
 
   void SetImmediateOutputStream(const lldb::StreamSP &stream_sp) {
+    if (m_hermetic)
+      return;
     m_out_stream.SetStreamAtIndex(eImmediateStreamIndex, stream_sp);
   }
 
   void SetImmediateErrorStream(const lldb::StreamSP &stream_sp) {
+    if (m_hermetic)
+      return;
     m_err_stream.SetStreamAtIndex(eImmediateStreamIndex, stream_sp);
   }
 
@@ -142,16 +150,26 @@
 
   void SetInteractive(bool b);
 
+  bool GetHermetic() const;
+
+  void SetHermetic(bool b);
+
 private:
   enum { eStreamStringIndex = 0, eImmediateStreamIndex = 1 };
 
   StreamTee m_out_stream;
   StreamTee m_err_stream;
 
-  lldb::ReturnStatus m_status;
-  bool m_did_change_process_state;
-  bool m_interactive; // If true, then the input handle from the debugger will
-                      // be hooked up
+  lldb::ReturnStatus m_status = lldb::eReturnStatusStarted;
+
+  bool m_did_change_process_state = false;
+
+  /// If true, then the input handle from the debugger will be hooked up.
+  bool m_interactive = true;
+
+  /// If true, disallow immediate streams. Useful when using this return object
+  /// as a temporary.
+  bool m_hermetic = false;
 };
 
 } // namespace lldb_private
Index: lldb/source/Interpreter/CommandInterpreter.cpp
===================================================================
--- lldb/source/Interpreter/CommandInterpreter.cpp
+++ lldb/source/Interpreter/CommandInterpreter.cpp
@@ -2306,6 +2306,7 @@
 
     CommandReturnObject tmp_result(m_debugger.GetUseColor());
     tmp_result.SetInteractive(result.GetInteractive());
+    tmp_result.SetHermetic(true);
 
     // We might call into a regex or alias command, in which case the
     // add_to_history will get lost.  This m_command_source_depth dingus is the
Index: lldb/source/Interpreter/CommandReturnObject.cpp
===================================================================
--- lldb/source/Interpreter/CommandReturnObject.cpp
+++ lldb/source/Interpreter/CommandReturnObject.cpp
@@ -41,9 +41,7 @@
 }
 
 CommandReturnObject::CommandReturnObject(bool colors)
-    : m_out_stream(colors), m_err_stream(colors),
-      m_status(eReturnStatusStarted), m_did_change_process_state(false),
-      m_interactive(true) {}
+    : m_out_stream(colors), m_err_stream(colors) {}
 
 void CommandReturnObject::AppendErrorWithFormat(const char *format, ...) {
   if (!format)
@@ -152,6 +150,7 @@
   m_status = eReturnStatusStarted;
   m_did_change_process_state = false;
   m_interactive = true;
+  m_hermetic = false;
 }
 
 bool CommandReturnObject::GetDidChangeProcessState() {
@@ -165,3 +164,7 @@
 bool CommandReturnObject::GetInteractive() const { return m_interactive; }
 
 void CommandReturnObject::SetInteractive(bool b) { m_interactive = b; }
+
+bool CommandReturnObject::GetHermetic() const { return m_hermetic; }
+
+void CommandReturnObject::SetHermetic(bool b) { m_hermetic = b; }
Index: lldb/test/Shell/Breakpoint/breakpoint-command.test
===================================================================
--- /dev/null
+++ lldb/test/Shell/Breakpoint/breakpoint-command.test
@@ -0,0 +1,5 @@
+# RUN: %build %p/Inputs/dummy-target.c -o %t.out
+# RUN: %lldb %t.out -o 'b main' -o 'break command add 1 -o "script print(95000 + 126)"' -o 'r'
+
+# CHECK: 95125
+# CHECK-NOT: 95126
Index: lldb/test/Shell/ScriptInterpreter/Lua/nested_sessions.test
===================================================================
--- lldb/test/Shell/ScriptInterpreter/Lua/nested_sessions.test
+++ lldb/test/Shell/ScriptInterpreter/Lua/nested_sessions.test
@@ -7,6 +7,5 @@
 # CHECK-NEXT: foo foo
 # CHECK-NEXT: foo bar
 # CHECK-NEXT: foo bar
-# CHECK-NEXT: foo bar
 # CHECK: script
 # CHECK-NEXT: bar bar