Merge branch 'master' into 12101210

1 files changed, 83 insertions, 0 deletions

diff --git a/js/src/tests/test262/language/expressions/coalesce/short-circuit-number-0.js b/js/src/tests/test262/language/expressions/coalesce/short-circuit-number-0.js
new file mode 100644
index 0000000000..547f62a1cf
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/coalesce/short-circuit-number-0.js
@@ -0,0 +1,83 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Short circuit if the CoalesceExpressionHead is not undefined or null (0)
+esid: sec-conditional-operator
+info: |
+    ConditionalExpression :
+        ShortCircuitExpression
+        ShortCircuitExpression ? AssignmentExpression : AssignmentExpression
+
+    ShortCircuitExpression :
+        LogicalORExpression
+        CoalesceExpression
+
+    CoalesceExpression :
+        CoalesceExpressionHead ?? BitwiseORExpression
+
+    CoalesceExpressionHead :
+        CoalesceExpression
+        BitwiseORExpression
+
+    Runtime Semantics: Evaluation
+
+    CoalesceExpression:CoalesceExpressionHead??BitwiseORExpression
+
+    1. Let lref be the result of evaluating CoalesceExpressionHead.
+    2. Let lval be ? GetValue(lref).
+    3. If lval is undefined or null,
+        a. Let rref be the result of evaluating BitwiseORExpression.
+        b. Return ? GetValue(rref).
+    4. Otherwise, return lval.
+features: [coalesce-expression]
+---*/
+
+var x;
+
+x = undefined;
+x = 0 ?? 1;
+assert.sameValue(x, 0, '0 ?? 1');
+
+x = undefined;
+x = 0 ?? null;
+assert.sameValue(x, 0, '0 ?? null');
+
+x = undefined;
+x = 0 ?? undefined;
+assert.sameValue(x, 0, '0 ?? undefined');
+
+x = undefined;
+x = 0 ?? null ?? undefined;
+assert.sameValue(x, 0, '0 ?? null ?? undefined');
+
+x = undefined;
+x = 0 ?? undefined ?? null;
+assert.sameValue(x, 0, '0 ?? undefined ?? null');
+
+x = undefined;
+x = 0 ?? null ?? null;
+assert.sameValue(x, 0, '0 ?? null ?? null');
+
+x = undefined;
+x = 0 ?? undefined ?? undefined;
+assert.sameValue(x, 0, '0 ?? null ?? null');
+
+x = undefined;
+x = null ?? 0 ?? null;
+assert.sameValue(x, 0, 'null ?? 0 ?? null');
+
+x = undefined;
+x = null ?? 0 ?? undefined;
+assert.sameValue(x, 0, 'null ?? 0 ?? undefined');
+
+x = undefined;
+x = undefined ?? 0 ?? null;
+assert.sameValue(x, 0, 'undefined ?? 0 ?? null');
+
+x = undefined;
+x = undefined ?? 0 ?? undefined;
+assert.sameValue(x, 0, 'undefined ?? 0 ?? undefined');
+
+reportCompare(0, 0);