Start compiling identifiers.

We'll need this if we support the "L == foobar" syntax, and besides
it should really be up to the parser client whether or not they use
identifiers with no function call or property reference.

It also allows us to generate error messages for unknown identifers.

common/libeval_compiler/libeval_compiler.cpp

@@ -748,6 +748,29 @@ bool COMPILER::generateUCode( UCODE* aCode, CONTEXT* aPreflightContext )
             break;
         }
 
+        case TR_IDENTIFIER:
+        {
+            VAR_REF* vref = aCode->createVarRef( this, node->value.str, "" );
+
+            if( m_errorStatus.pendingError )
+            {
+                m_errorStatus.pendingError = true;
+                m_errorStatus.stage = ERROR_STATUS::CST_CODEGEN;
+
+                if( m_errorStatus.message == "var" )
+                {
+                    m_errorStatus.message.Printf( _( "Unrecognized item '%s'" ),
+                                                  node->value.str );
+                    m_errorStatus.srcPos = node->srcPos - strlen( node->value.str );
+                }
+
+                return false;
+            }
+
+            node->uop = makeUop( TR_UOP_PUSH_VALUE, vref );
+            break;
+        }
+
         default:
             node->uop = makeUop( node->op );
             break;