text: // Copyright (C) 2019 Leo Balter. All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  description: Expression is a candidate for tail-call optimization.
  esid: sec-static-semantics-hascallintailposition
  info: |
    Expression Rules
  
    CoalesceExpression : CoalesceExpressionHead ?? BitwiseORExpression
  
    1. Return HasCallInTailPosition of BitwiseORExpression with argument call.
  flags: [onlyStrict]
  features: [tail-call-optimization, coalesce-expression]
  includes: [tcoHelper.js]
  ---*/
  
  var callCount = 0;
  (function f(n) {
    if (n === 0) {
      callCount += 1
      return;
    }
    return null ?? f(n - 1);
  }($MAX_ITERATIONS));
  assert.sameValue(callCount, 1);
  