Index: lldb/trunk/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
===================================================================
--- lldb/trunk/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
+++ lldb/trunk/packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libcxx/map/TestDataFormatterLibccMap.py
@@ -52,13 +52,26 @@
         self.addTearDownHook(cleanup)
 
         ns = self.namespace
-        self.expect('frame variable ii',
+        self.expect('p ii',
+                    substrs=['%s::map' % ns,
+                             'size=0',
+                             '{}'])
+        self.expect('frame var ii',
                     substrs=['%s::map' % ns,
                              'size=0',
                              '{}'])
 
         lldbutil.continue_to_breakpoint(self.process(), bkpt)
 
+        self.expect('p ii',
+                    substrs=['%s::map' % ns, 'size=2',
+                             '[0] = ',
+                             'first = 0',
+                             'second = 0',
+                             '[1] = ',
+                             'first = 1',
+                             'second = 1'])
+
         self.expect('frame variable ii',
                     substrs=['%s::map' % ns, 'size=2',
                              '[0] = ',
@@ -81,7 +94,7 @@
 
         lldbutil.continue_to_breakpoint(self.process(), bkpt)
 
-        self.expect("frame variable ii",
+        self.expect("p ii",
                     substrs=['%s::map' % ns, 'size=8',
                              '[5] = ',
                              'first = 5',
@@ -90,7 +103,7 @@
                              'first = 7',
                              'second = 1'])
 
-        self.expect("p ii",
+        self.expect("frame var ii",
                     substrs=['%s::map' % ns, 'size=8',
                              '[5] = ',
                              'first = 5',
Index: lldb/trunk/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
===================================================================
--- lldb/trunk/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
+++ lldb/trunk/source/Plugins/ExpressionParser/Clang/ClangASTSource.cpp
@@ -650,6 +650,20 @@
 
         m_ast_importer_sp->RequireCompleteType(copied_field_type);
       }
+      auto decl_context_non_const = const_cast<DeclContext *>(decl_context);
+
+      // The decl ended up in the wrong DeclContext. Let's fix that so
+      // the decl we copied will actually be found.
+      // FIXME: This is a horrible hack that shouldn't be necessary. However
+      // it seems our current setup sometimes fails to copy decls to the right
+      // place. See rdar://55129537.
+      if (copied_decl->getDeclContext() != decl_context) {
+        assert(copied_decl->getDeclContext()->containsDecl(copied_decl));
+        copied_decl->getDeclContext()->removeDecl(copied_decl);
+        copied_decl->setDeclContext(decl_context_non_const);
+        assert(!decl_context_non_const->containsDecl(copied_decl));
+        decl_context_non_const->addDeclInternal(copied_decl);
+      }
     } else {
       SkippedDecls = true;
     }