From bf53bc42564dcfb28c28d135e23455f78c7e1249 Mon Sep 17 00:00:00 2001
From: Dylan <dylwil3@gmail.com>
Date: Sat, 7 Jun 2025 11:30:45 -0500
Subject: [PATCH] [syntax errors] Stabilize version-specific unsupported syntax
 errors (#18522)

---
 crates/ruff/tests/lint.rs         | 11 ++++++-----
 crates/ruff_linter/src/linter.rs  |  8 ++------
 crates/ruff_linter/src/preview.rs |  5 -----
 crates/ruff_wasm/tests/api.rs     |  2 +-
 4 files changed, 9 insertions(+), 17 deletions(-)

diff --git a/crates/ruff/tests/lint.rs b/crates/ruff/tests/lint.rs
index 49191f5099..fa60551625 100644
--- a/crates/ruff/tests/lint.rs
+++ b/crates/ruff/tests/lint.rs
@@ -5436,14 +5436,15 @@ match 2:
         print("it's one")
 "#
         ),
-        @r"
-    success: true
-    exit_code: 0
+        @r###"
+    success: false
+    exit_code: 1
     ----- stdout -----
-    All checks passed!
+    test.py:2:1: SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)
+    Found 1 error.
 
     ----- stderr -----
-    "
+    "###
     );
 
     // syntax error on 3.9 with preview
diff --git a/crates/ruff_linter/src/linter.rs b/crates/ruff_linter/src/linter.rs
index 2b31495b2a..422c1348c5 100644
--- a/crates/ruff_linter/src/linter.rs
+++ b/crates/ruff_linter/src/linter.rs
@@ -30,7 +30,7 @@ use crate::fix::{FixResult, fix_file};
 use crate::message::Message;
 use crate::noqa::add_noqa;
 use crate::package::PackageRoot;
-use crate::preview::{is_py314_support_enabled, is_unsupported_syntax_enabled};
+use crate::preview::is_py314_support_enabled;
 use crate::registry::{AsRule, Rule, RuleSet};
 #[cfg(any(feature = "test-rules", test))]
 use crate::rules::ruff::rules::test_rules::{self, TEST_RULES, TestRule};
@@ -447,11 +447,7 @@ pub fn check_path(
         }
     }
 
-    let syntax_errors = if is_unsupported_syntax_enabled(settings) {
-        parsed.unsupported_syntax_errors()
-    } else {
-        &[]
-    };
+    let syntax_errors = parsed.unsupported_syntax_errors();
 
     diagnostics_to_messages(
         diagnostics,
diff --git a/crates/ruff_linter/src/preview.rs b/crates/ruff_linter/src/preview.rs
index 6a3c7e818b..7ed2a03333 100644
--- a/crates/ruff_linter/src/preview.rs
+++ b/crates/ruff_linter/src/preview.rs
@@ -13,11 +13,6 @@ pub(crate) const fn is_semantic_errors_enabled(settings: &LinterSettings) -> boo
     settings.preview.is_enabled()
 }
 
-// https://github.com/astral-sh/ruff/pull/16429
-pub(crate) const fn is_unsupported_syntax_enabled(settings: &LinterSettings) -> bool {
-    settings.preview.is_enabled()
-}
-
 pub(crate) const fn is_py314_support_enabled(settings: &LinterSettings) -> bool {
     settings.preview.is_enabled()
 }
diff --git a/crates/ruff_wasm/tests/api.rs b/crates/ruff_wasm/tests/api.rs
index 32177e6bb6..036a435de0 100644
--- a/crates/ruff_wasm/tests/api.rs
+++ b/crates/ruff_wasm/tests/api.rs
@@ -65,7 +65,7 @@ fn syntax_error() {
 fn unsupported_syntax_error() {
     check!(
         "match 2:\n    case 1: ...",
-        r#"{"preview": true, "target-version": "py39"}"#,
+        r#"{"target-version": "py39"}"#,
         [ExpandedMessage {
             code: None,
             message: "SyntaxError: Cannot use `match` statement on Python 3.9 (syntax was added in Python 3.10)".to_string(),