From 4f25f2c74907f876b57d4f79bc711dd85a9a9361 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20Juli=C3=A1n=20Espina?= <jedel0124@gmail.com>
Date: Wed, 17 May 2023 17:27:58 +0000
Subject: [PATCH] Allow escaped `async` as binding name (#2936)

---
 boa_parser/src/parser/expression/assignment/mod.rs        | 2 +-
 boa_parser/src/parser/expression/primary/mod.rs           | 8 +-------
 boa_parser/src/parser/statement/expression/mod.rs         | 6 ++----
 .../src/parser/statement/iteration/for_statement.rs       | 2 +-
 boa_parser/src/parser/statement/mod.rs                    | 2 +-
 5 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/boa_parser/src/parser/expression/assignment/mod.rs b/boa_parser/src/parser/expression/assignment/mod.rs
index 3bda3a0f3f..33ea651efc 100644
--- a/boa_parser/src/parser/expression/assignment/mod.rs
+++ b/boa_parser/src/parser/expression/assignment/mod.rs
@@ -134,7 +134,7 @@ where
                 }
             }
             //  AsyncArrowFunction[?In, ?Yield, ?Await]
-            TokenKind::Keyword((Keyword::Async, _)) => {
+            TokenKind::Keyword((Keyword::Async, false)) => {
                 let skip_n = if cursor.peek_is_line_terminator(0, interner).or_abrupt()? {
                     2
                 } else {
diff --git a/boa_parser/src/parser/expression/primary/mod.rs b/boa_parser/src/parser/expression/primary/mod.rs
index e542f6ef36..16a8c258c7 100644
--- a/boa_parser/src/parser/expression/primary/mod.rs
+++ b/boa_parser/src/parser/expression/primary/mod.rs
@@ -143,14 +143,8 @@ where
 
                 match cursor.peek(1, interner)?.map(Token::kind) {
                     Some(TokenKind::Keyword((Keyword::Function, _)))
-                        if !is_line_terminator && contain_escaped_char =>
+                        if !is_line_terminator && !contain_escaped_char =>
                     {
-                        Err(Error::general(
-                            "Keyword must not contain escaped characters",
-                            tok_position,
-                        ))
-                    }
-                    Some(TokenKind::Keyword((Keyword::Function, _))) if !is_line_terminator => {
                         cursor.advance(interner);
                         match cursor.peek(1, interner)?.map(Token::kind) {
                             Some(TokenKind::Punctuator(Punctuator::Mul)) => {
diff --git a/boa_parser/src/parser/statement/expression/mod.rs b/boa_parser/src/parser/statement/expression/mod.rs
index 287b224002..60a7c2e031 100644
--- a/boa_parser/src/parser/statement/expression/mod.rs
+++ b/boa_parser/src/parser/statement/expression/mod.rs
@@ -47,7 +47,7 @@ where
 
         let next_token = cursor.peek(0, interner).or_abrupt()?;
         match next_token.kind() {
-            TokenKind::Keyword((Keyword::Function | Keyword::Class | Keyword::Async, true)) => {
+            TokenKind::Keyword((Keyword::Function | Keyword::Class, true)) => {
                 return Err(Error::general(
                     "Keyword must not contain escaped characters",
                     next_token.span().start(),
@@ -69,9 +69,7 @@ where
                     .peek_is_line_terminator(skip_n, interner)?
                     .unwrap_or(true);
 
-                if is_line_terminator {
-                    {}
-                } else {
+                if !is_line_terminator {
                     let next_token = cursor.peek(1, interner).or_abrupt()?;
                     match next_token.kind() {
                         TokenKind::Keyword((Keyword::Function, true)) => {
diff --git a/boa_parser/src/parser/statement/iteration/for_statement.rs b/boa_parser/src/parser/statement/iteration/for_statement.rs
index 3c839d727b..7808876d46 100644
--- a/boa_parser/src/parser/statement/iteration/for_statement.rs
+++ b/boa_parser/src/parser/statement/iteration/for_statement.rs
@@ -135,7 +135,7 @@ where
                     .parse(cursor, interner)?
                     .into(),
             ),
-            TokenKind::Keyword((Keyword::Async, false)) => {
+            TokenKind::Keyword((Keyword::Async, false)) if !r#await => {
                 match cursor.peek(1, interner).or_abrupt()?.kind() {
                     TokenKind::Keyword((Keyword::Of, _)) => {
                         return Err(Error::lex(LexError::Syntax(
diff --git a/boa_parser/src/parser/statement/mod.rs b/boa_parser/src/parser/statement/mod.rs
index 79eb8678fa..70f846dbc7 100644
--- a/boa_parser/src/parser/statement/mod.rs
+++ b/boa_parser/src/parser/statement/mod.rs
@@ -421,7 +421,7 @@ where
             ) => Declaration::new(self.allow_yield, self.allow_await)
                 .parse(cursor, interner)
                 .map(ast::StatementListItem::from),
-            TokenKind::Keyword((Keyword::Async, _)) => {
+            TokenKind::Keyword((Keyword::Async, false)) => {
                 let skip_n = if cursor.peek_is_line_terminator(0, interner).or_abrupt()? {
                     2
                 } else {