fix(codegen): print #field in {} << 0; correctly (#6799)

crates/oxc_codegen/src/binary_expr_visitor.rs

@@ -196,6 +196,12 @@ impl<'a> BinaryExpressionVisitor<'a> {
             _ => {}
         }
 
+        if let Expression::PrivateInExpression(e) = self.e.left() {
+            e.gen_expr(p, Precedence::Lowest, Context::empty());
+            self.visit_right_and_finish(p);
+            return false;
+        }
+
         true
     }
 

crates/oxc_codegen/src/gen.rs

@@ -1700,7 +1700,7 @@ impl<'a> GenExpr for PrivateInExpression<'a> {
         p.wrap(precedence >= Precedence::Compare, |p| {
             self.left.print(p, ctx);
             p.print_str(" in ");
-            self.right.print_expr(p, Precedence::Equals, Context::empty());
+            self.right.print_expr(p, Precedence::Equals, Context::FORBID_IN);
         });
     }
 }

crates/oxc_codegen/tests/integration/unit.rs

@@ -11,18 +11,24 @@ fn module_decl() {
 #[test]
 fn expr() {
     test("new (foo()).bar();", "new (foo()).bar();\n");
-    test(
-        "class Foo { #test
-          bar() { if (!(#test in Foo)) { } }
-        }",
-        "class Foo {\n\t#test;\n\tbar() {\n\t\tif (!(#test in Foo)) {}\n\t}\n}\n",
-    );
     test_minify("x in new Error()", "x in new Error();");
 
     test("1000000000000000128.0.toFixed(0)", "0xde0b6b3a7640080.toFixed(0);\n");
     test_minify("1000000000000000128.0.toFixed(0)", "0xde0b6b3a7640080.toFixed(0);");
 }
 
+#[test]
+fn private_in() {
+    test(
+        "class Foo { #test; bar() { if (!(#test in Foo)) { } } }",
+        "class Foo {\n\t#test;\n\tbar() {\n\t\tif (!(#test in Foo)) {}\n\t}\n}\n",
+    );
+    test(
+        "class Foo { #test; bar() { #field in {} << 0 } }",
+        "class Foo {\n\t#test;\n\tbar() {\n\t\t#field in {} << 0;\n\t}\n}\n",
+    );
+}
+
 #[test]
 fn access_property() {
     test(

tasks/coverage/snapshots/runtime.snap

@@ -2,7 +2,7 @@ commit: 06454619
 
 runtime Summary:
 AST Parsed     : 18446/18446 (100.00%)
-Positive Passed: 17183/18446 (93.15%)
+Positive Passed: 17184/18446 (93.16%)
 tasks/coverage/test262/test/annexB/language/function-code/block-decl-func-block-scoping.js
 minify error: ReferenceError: f is not defined
 
@@ -1758,9 +1758,6 @@ minify error: Test262Error: The result of (1n > "0.") is false Expected SameValu
 tasks/coverage/test262/test/language/expressions/greater-than-or-equal/bigint-and-incomparable-string.js
 minify error: Test262Error: The result of (1n >= "0.") is false Expected SameValue(«true», «false») to be true
 
-tasks/coverage/test262/test/language/expressions/in/private-field-rhs-non-object.js
-codegen error: Test262Error: Expected SameValue(«null», «null») to be false
-
 tasks/coverage/test262/test/language/expressions/less-than/bigint-and-incomparable-string.js
 minify error: Test262Error: The result of ("0." < 1n) is false Expected SameValue(«true», «false») to be true