LibJS: Update a couple of outdated spec comments

These are editorial changes in the ECMA-262 spec.

See:
- https://github.com/tc39/ecma262/commit/e080a7f
- https://github.com/tc39/ecma262/commit/c5a9094
- https://github.com/tc39/ecma262/commit/5091520
- https://github.com/tc39/ecma262/commit/1c6564b
- https://github.com/tc39/ecma262/commit/e06c80c

1 files changed, 6 insertions, 3 deletions

diff --git a/Userland/Libraries/LibJS/Parser.cpp b/Userland/Libraries/LibJS/Parser.cpp
index 56bf3ca4a4..58329d7714 100644
--- a/Userland/Libraries/LibJS/Parser.cpp
+++ b/Userland/Libraries/LibJS/Parser.cpp
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2020, Stephan Unverwerth <s.unverwerth@serenityos.org>
- * Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
  * Copyright (c) 2021-2022, David Tuin <davidot@serenityos.org>
  * Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
  * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
@@ -3343,9 +3343,12 @@ NonnullRefPtr<IfStatement> Parser::parse_if_statement()
     auto rule_start = push_start();
     auto parse_function_declaration_as_block_statement = [&] {
         // https://tc39.es/ecma262/#sec-functiondeclarations-in-ifstatement-statement-clauses
-        // Code matching this production is processed as if each matching occurrence of
+        // This production only applies when parsing non-strict code. Source text matched
+        // by this production is processed as if each matching occurrence of
         // FunctionDeclaration[?Yield, ?Await, ~Default] was the sole StatementListItem
-        // of a BlockStatement occupying that position in the source code.
+        // of a BlockStatement occupying that position in the source text.
+        // The semantics of such a synthetic BlockStatement includes the web legacy
+        // compatibility semantics specified in B.3.2.
         VERIFY(match(TokenType::Function));
         auto block = create_ast_node<BlockStatement>({ m_state.current_token.filename(), rule_start.position(), position() });
         ScopePusher block_scope = ScopePusher::block_scope(*this, *block);