Computed Property Names: YieldExpression that yields something.

test/language/expressions/object/method-definition/computed-property-name-yield-expression.js

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+// Copyright (C) 2020 Rick Waldron. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    When the `yield` keyword occurs within the PropertyName of a
+    non-generator MethodDefinition within a generator function, it behaves as a
+    YieldExpression.
+info: |
+  ComputedPropertyName:
+    [ AssignmentExpression ]
+
+  AssignmentExpression[In, Yield, Await]:
+    [+Yield]YieldExpression[?In, ?Await]
+
+features: [computed-property-names, generators]
+flags: [noStrict]
+---*/
+
+function * g() {
+  let o = {
+    [yield 10]: 1,
+    a: 'a'
+  };
+
+  yield 20;
+  return o;
+}
+
+let iter = g();
+assert.sameValue(iter.next().value, 10);
+assert.sameValue(iter.next().value, 20);
+
+let outcome = iter.next().value;
+
+assert.sameValue(outcome[undefined], 1);
+assert.sameValue(outcome.a, 'a');
+