Test `await` in ConditionalExpression

test/language/expressions/await/syntax-await-in-ConditionalExpression.js

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+// Copyright (C) 2024 Richard Gibson. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: prod-ConditionalExpression
+description: >
+    await binds more tightly than conditional operators
+info: |
+    ConditionalExpression[In, Yield, Await] :
+      ShortCircuitExpression[?In, ?Yield, ?Await]
+      ShortCircuitExpression[?In, ?Yield, ?Await] `?` AssignmentExpression[+In, ?Yield, ?Await] `:` AssignmentExpression[?In, ?Yield, ?Await]
+    
+    ShortCircuitExpression[In, Yield, Await] :
+      LogicalORExpression[?In, ?Yield, ?Await]
+      CoalesceExpression[?In, ?Yield, ?Await]
+    
+    LogicalORExpression[In, Yield, Await] :
+      LogicalANDExpression[?In, ?Yield, ?Await]
+      LogicalORExpression[?In, ?Yield, ?Await] `||` LogicalANDExpression[?In, ?Yield, ?Await]
+    
+    LogicalANDExpression[In, Yield, Await] :
+      BitwiseORExpression[?In, ?Yield, ?Await]
+      LogicalANDExpression[?In, ?Yield, ?Await] `&&` BitwiseORExpression[?In, ?Yield, ?Await]
+    
+    BitwiseORExpression[In, Yield, Await] :
+      BitwiseXORExpression[?In, ?Yield, ?Await]
+    
+    BitwiseXORExpression[In, Yield, Await] :
+      BitwiseANDExpression[?In, ?Yield, ?Await]
+    
+    BitwiseANDExpression[In, Yield, Await] :
+      EqualityExpression[?In, ?Yield, ?Await]
+    
+    EqualityExpression[In, Yield, Await] :
+      RelationalExpression[?In, ?Yield, ?Await]
+    
+    RelationalExpression[In, Yield, Await] :
+      ShiftExpression[?Yield, ?Await]
+    
+    ShiftExpression[Yield, Await] :
+      AdditiveExpression[?Yield, ?Await]
+    
+    AdditiveExpression[Yield, Await] :
+      MultiplicativeExpression[?Yield, ?Await]
+    
+    MultiplicativeExpression[Yield, Await] :
+      ExponentiationExpression[?Yield, ?Await]
+    
+    ExponentiationExpression[Yield, Await] :
+      UnaryExpression[?Yield, ?Await]
+    
+    UnaryExpression[Yield, Await] :
+      UpdateExpression[?Yield, ?Await]
+      [+Await] AwaitExpression[?Yield]
+    
+    AwaitExpression[Yield] :
+      `await` UnaryExpression[?Yield, +Await]
+flags: [async]
+includes: [asyncHelpers.js]
+---*/
+
+async function foo() {
+  let x = 'initial value';
+  let shouldNotBeAwaited = {
+    then: function(onFulfilled) {
+      x = 'unexpected then() call';
+      Promise.resolve().then(onFulfilled);
+    }
+  };
+  // This must parse like `(await false) || shouldNotBeAwaited`.
+  await false || shouldNotBeAwaited;
+  assert.sameValue(x, 'initial value');
+}
+asyncTest(foo);