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diff --git a/src/class-fields/computed-name-toprimitive-returns-nonobject.js b/src/class-fields/computed-name-toprimitive-returns-nonobject.js
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+// Copyright (C) 2017 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+desc: Custom error evaluating a computed property name
+info: |
+  Runtime Semantics: ClassDefinitionEvaluation
+
+  ...
+  27. For each ClassElement e in order from elements
+    a. If IsStatic of me is false, then
+      i. Let fields be the result of performing ClassElementEvaluation for e with arguments proto and false.
+    b. Else,
+      i. Let fields be the result of performing ClassElementEvaluation for e with arguments F and false.
+    c. If fields is an abrupt completion, then
+      i. Set the running execution context's LexicalEnvironment to lex.
+      ii. Set the running execution context's PrivateNameEnvironment to outerPrivateEnvironment.
+      iii. Return Completion(status).
+  ...
+
+  Runtime Semantics: ClassElementEvaluation
+
+  ClassElement: static FieldDefinition;
+    Return ClassFieldDefinitionEvaluation of FieldDefinition with parameter true and object.
+
+  ClassElement: FieldDefinition;
+    Return ClassFieldDefinitionEvaluation of FieldDefinition with parameter false and object.
+
+  Runtime Semantics: ClassFieldDefinitionEvaluation
+    With parameters isStatic and homeObject.
+
+  1. Let fieldName be the result of evaluating ClassElementName.
+  2. ReturnIfAbrupt(fieldName).
+  ...
+
+  Runtime Semantics: Evaluation
+    ComputedPropertyName: [ AssignmentExpression ]
+  
+  1. Let exprValue be the result of evaluating AssignmentExpression.
+  2. Let propName be ? GetValue(exprValue).
+  3. Return ? ToPropertyKey(propName).
+template: class-evaluation-error
+features: [computed-property-names, Symbol.toPrimitive]
+---*/
+
+//- setup
+var obj = {
+  [Symbol.toPrimitive]: 42
+};
+
+//- fields
+[obj] = refErrorIfEvaluated;
+//- error
+TypeError