Index: source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
===================================================================
--- source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
+++ source/Plugins/ExpressionParser/Clang/ClangExpressionParser.h
@@ -158,8 +158,10 @@
 
   class LLDBPreprocessorCallbacks;
   LLDBPreprocessorCallbacks *m_pp_callbacks; ///< Called when the preprocessor
-                                             ///encounters module imports
+                                             /// encounters module imports
   std::unique_ptr<ClangASTContext> m_ast_context;
+  lldb::LanguageType m_language; ///< The source language of the expression
+                                 /// which may be explicitly set or inferred.
 };
 }
 
Index: source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
===================================================================
--- source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
+++ source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp
@@ -253,8 +253,7 @@
 
   // 1. Create a new compiler instance.
   m_compiler.reset(new CompilerInstance());
-  lldb::LanguageType frame_lang =
-      expr.Language(); // defaults to lldb::eLanguageTypeUnknown
+  m_language = expr.Language(); // defaults to lldb::eLanguageTypeUnknown
   bool overridden_target_opts = false;
   lldb_private::LanguageRuntime *lang_rt = nullptr;
 
@@ -272,14 +271,14 @@
 
   // Make sure the user hasn't provided a preferred execution language
   // with `expression --language X -- ...`
-  if (frame_sp && frame_lang == lldb::eLanguageTypeUnknown)
-    frame_lang = frame_sp->GetLanguage();
+  if (frame_sp && m_language == lldb::eLanguageTypeUnknown)
+    m_language = frame_sp->GetLanguage();
 
-  if (process_sp && frame_lang != lldb::eLanguageTypeUnknown) {
-    lang_rt = process_sp->GetLanguageRuntime(frame_lang);
+  if (process_sp && m_language != lldb::eLanguageTypeUnknown) {
+    lang_rt = process_sp->GetLanguageRuntime(m_language);
     if (log)
       log->Printf("Frame has language of type %s",
-                  Language::GetNameForLanguageType(frame_lang));
+                  Language::GetNameForLanguageType(m_language));
   }
 
   // 2. Configure the compiler with a set of default options that are
@@ -372,9 +371,7 @@
   assert(m_compiler->hasTarget());
 
   // 5. Set language options.
-  lldb::LanguageType language = expr.Language();
-
-  switch (language) {
+  switch (m_language) {
   case lldb::eLanguageTypeC:
   case lldb::eLanguageTypeC89:
   case lldb::eLanguageTypeC99:
@@ -804,13 +801,12 @@
 
   LLVMUserExpression::IRPasses custom_passes;
   {
-    auto lang = m_expr.Language();
     if (log)
       log->Printf("%s - Currrent expression language is %s\n", __FUNCTION__,
-                  Language::GetNameForLanguageType(lang));
+                  Language::GetNameForLanguageType(m_language));
     lldb::ProcessSP process_sp = exe_ctx.GetProcessSP();
-    if (process_sp && lang != lldb::eLanguageTypeUnknown) {
-      auto runtime = process_sp->GetLanguageRuntime(lang);
+    if (process_sp && m_language != lldb::eLanguageTypeUnknown) {
+      auto runtime = process_sp->GetLanguageRuntime(m_language);
       if (runtime)
         runtime->GetIRPasses(custom_passes);
     }