Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/js/src/tests/test262/language/expressions/function/scope-body-lex-distinct.js b/js/src/tests/test262/language/expressions/function/scope-body-lex-distinct.js
new file mode 100644
index 0000000000..7cba86042e
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/function/scope-body-lex-distinct.js
@@ -0,0 +1,51 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-functiondeclarationinstantiation
+description: >
+    Creation of new lexical environment (distinct from the variable
+    environment) for the function body outside of strict mode
+info: |
+    [...]
+    29. If strict is false, then
+        a. Let lexEnv be NewDeclarativeEnvironment(varEnv).
+        b. NOTE: Non-strict functions use a separate lexical Environment Record
+           for top-level lexical declarations so that a direct eval can
+           determine whether any var scoped declarations introduced by the eval
+           code conflict with pre-existing top-level lexically scoped
+           declarations.  This is not needed for strict functions because a
+           strict direct eval always places all declarations into a new
+           Environment Record.
+    [...]
+
+    18.2.1.3 Runtime Semantics: EvalDeclarationInstantiation
+
+    [...]
+    5. If strict is false, then
+       [...]
+       b. Let thisLex be lexEnv.
+       c. Assert: The following loop will terminate.
+       d. Repeat while thisLex is not the same as varEnv,
+          i. Let thisEnvRec be thisLex's EnvironmentRecord.
+          ii. If thisEnvRec is not an object Environment Record, then
+              1. NOTE: The environment of with statements cannot contain any
+                 lexical declaration so it doesn't need to be checked for
+                 var/let hoisting conflicts.
+              2. For each name in varNames, do
+                 a. If thisEnvRec.HasBinding(name) is true, then
+                    i. Throw a SyntaxError exception.
+                    ii. NOTE: Annex B.3.5 defines alternate semantics for the
+                        above step.
+                 b. NOTE: A direct eval will not hoist var declaration over a
+                    like-named lexical declaration.
+          iii. Let thisLex be thisLex's outer environment reference.
+flags: [noStrict]
+features: [let]
+---*/
+
+assert.throws(SyntaxError, function() {
+  let x;
+  eval('var x;');
+});
+
+reportCompare(0, 0);