getLiteralTypeFromProperty-check privateIdentifier

Author: mheiber

src/compiler/checker.ts

@@ -10005,6 +10005,9 @@ namespace ts {
                     }
                     else {
                         const name = prop.valueDeclaration && getNameOfDeclaration(prop.valueDeclaration) as PropertyName;
+                        if (isPrivateIdentifier(name)) {
+                            return neverType;
+                        }
                         type = name && getLiteralTypeFromPropertyName(name) || getLiteralType(symbolName(prop));
                     }
                 }