diff --git a/crates/parser/src/grammar/expressions/atom.rs b/crates/parser/src/grammar/expressions/atom.rs
index 54c874d06c..3d7d85a539 100644
--- a/crates/parser/src/grammar/expressions/atom.rs
+++ b/crates/parser/src/grammar/expressions/atom.rs
@@ -145,7 +145,7 @@ pub(super) fn atom_expr(
             stmt_list(p);
             m.complete(p, BLOCK_EXPR)
         }
-        // test_err gen_blocks
+        // test gen_blocks 2024
         // pub fn main() {
         //     gen { yield ""; };
         //     async gen { yield ""; };
diff --git a/crates/parser/src/tests.rs b/crates/parser/src/tests.rs
index e0042fbdec..b4b6759e90 100644
--- a/crates/parser/src/tests.rs
+++ b/crates/parser/src/tests.rs
@@ -51,7 +51,7 @@ fn lex(text: &str) -> String {
 fn parse_ok() {
     for case in TestCase::list("parser/ok") {
         let _guard = stdx::panic_context::enter(format!("{:?}", case.rs));
-        let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
+        let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text, Edition::CURRENT);
         assert!(!errors, "errors in an OK file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual);
     }
@@ -61,16 +61,16 @@ fn parse_ok() {
 fn parse_err() {
     for case in TestCase::list("parser/err") {
         let _guard = stdx::panic_context::enter(format!("{:?}", case.rs));
-        let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text);
+        let (actual, errors) = parse(TopEntryPoint::SourceFile, &case.text, Edition::CURRENT);
         assert!(errors, "no errors in an ERR file {}:\n{actual}", case.rs.display());
         expect_file![case.rast].assert_eq(&actual)
     }
 }
 
-fn parse(entry: TopEntryPoint, text: &str) -> (String, bool) {
-    let lexed = LexedStr::new(Edition::CURRENT, text);
+fn parse(entry: TopEntryPoint, text: &str, edition: Edition) -> (String, bool) {
+    let lexed = LexedStr::new(edition, text);
     let input = lexed.to_input();
-    let output = entry.parse(&input, Edition::CURRENT);
+    let output = entry.parse(&input, edition);
 
     let mut buf = String::new();
     let mut errors = Vec::new();
@@ -153,9 +153,19 @@ impl TestCase {
 
 #[track_caller]
 fn run_and_expect_no_errors(path: &str) {
+    run_and_expect_no_errors_with_edition(path, Edition::CURRENT)
+}
+
+#[track_caller]
+fn run_and_expect_errors(path: &str) {
+    run_and_expect_errors_with_edition(path, Edition::CURRENT)
+}
+
+#[track_caller]
+fn run_and_expect_no_errors_with_edition(path: &str, edition: Edition) {
     let path = PathBuf::from(path);
     let text = std::fs::read_to_string(&path).unwrap();
-    let (actual, errors) = parse(TopEntryPoint::SourceFile, &text);
+    let (actual, errors) = parse(TopEntryPoint::SourceFile, &text, edition);
     assert!(!errors, "errors in an OK file {}:\n{actual}", path.display());
     let mut p = PathBuf::from("..");
     p.push(path);
@@ -164,10 +174,10 @@ fn run_and_expect_no_errors(path: &str) {
 }
 
 #[track_caller]
-fn run_and_expect_errors(path: &str) {
+fn run_and_expect_errors_with_edition(path: &str, edition: Edition) {
     let path = PathBuf::from(path);
     let text = std::fs::read_to_string(&path).unwrap();
-    let (actual, errors) = parse(TopEntryPoint::SourceFile, &text);
+    let (actual, errors) = parse(TopEntryPoint::SourceFile, &text, edition);
     assert!(errors, "no errors in an ERR file {}:\n{actual}", path.display());
     let mut p = PathBuf::from("..");
     p.push(path);
diff --git a/crates/parser/src/tests/top_entries.rs b/crates/parser/src/tests/top_entries.rs
index 49dd9e293b..c56bf0b644 100644
--- a/crates/parser/src/tests/top_entries.rs
+++ b/crates/parser/src/tests/top_entries.rs
@@ -307,6 +307,6 @@ fn expr() {
 
 #[track_caller]
 fn check(entry: TopEntryPoint, input: &str, expect: expect_test::Expect) {
-    let (parsed, _errors) = super::parse(entry, input);
+    let (parsed, _errors) = super::parse(entry, input, crate::Edition::CURRENT);
     expect.assert_eq(&parsed)
 }
diff --git a/crates/parser/test_data/generated/runner.rs b/crates/parser/test_data/generated/runner.rs
index f82d1ed320..aa8210541a 100644
--- a/crates/parser/test_data/generated/runner.rs
+++ b/crates/parser/test_data/generated/runner.rs
@@ -1,5 +1,5 @@
 mod ok {
-    use crate::tests::run_and_expect_no_errors;
+    use crate::tests::*;
     #[test]
     fn anonymous_const() {
         run_and_expect_no_errors("test_data/parser/inline/ok/anonymous_const.rs");
@@ -267,6 +267,13 @@ mod ok {
         run_and_expect_no_errors("test_data/parser/inline/ok/function_where_clause.rs");
     }
     #[test]
+    fn gen_blocks() {
+        run_and_expect_no_errors_with_edition(
+            "test_data/parser/inline/ok/gen_blocks.rs",
+            crate::Edition::Edition2024,
+        );
+    }
+    #[test]
     fn generic_arg() { run_and_expect_no_errors("test_data/parser/inline/ok/generic_arg.rs"); }
     #[test]
     fn generic_param_attribute() {
@@ -666,7 +673,7 @@ mod ok {
     fn yield_expr() { run_and_expect_no_errors("test_data/parser/inline/ok/yield_expr.rs"); }
 }
 mod err {
-    use crate::tests::run_and_expect_errors;
+    use crate::tests::*;
     #[test]
     fn angled_path_without_qual() {
         run_and_expect_errors("test_data/parser/inline/err/angled_path_without_qual.rs");
@@ -708,8 +715,6 @@ mod err {
         run_and_expect_errors("test_data/parser/inline/err/fn_pointer_type_missing_fn.rs");
     }
     #[test]
-    fn gen_blocks() { run_and_expect_errors("test_data/parser/inline/err/gen_blocks.rs"); }
-    #[test]
     fn gen_fn() { run_and_expect_errors("test_data/parser/inline/err/gen_fn.rs"); }
     #[test]
     fn generic_arg_list_recover() {
diff --git a/crates/parser/test_data/parser/inline/err/gen_blocks.rast b/crates/parser/test_data/parser/inline/err/gen_blocks.rast
deleted file mode 100644
index 08a85891ed..0000000000
--- a/crates/parser/test_data/parser/inline/err/gen_blocks.rast
+++ /dev/null
@@ -1,139 +0,0 @@
-SOURCE_FILE
-  FN
-    VISIBILITY
-      PUB_KW "pub"
-    WHITESPACE " "
-    FN_KW "fn"
-    WHITESPACE " "
-    NAME
-      IDENT "main"
-    PARAM_LIST
-      L_PAREN "("
-      R_PAREN ")"
-    WHITESPACE " "
-    BLOCK_EXPR
-      STMT_LIST
-        L_CURLY "{"
-        WHITESPACE "\n    "
-        EXPR_STMT
-          RECORD_EXPR
-            PATH
-              PATH_SEGMENT
-                NAME_REF
-                  IDENT "gen"
-            WHITESPACE " "
-            RECORD_EXPR_FIELD_LIST
-              L_CURLY "{"
-              WHITESPACE " "
-              ERROR
-                YIELD_KW "yield"
-              WHITESPACE " "
-              ERROR
-                STRING "\"\""
-              ERROR
-                SEMICOLON ";"
-              WHITESPACE " "
-              R_CURLY "}"
-          SEMICOLON ";"
-        WHITESPACE "\n    "
-        ERROR
-          ASYNC_KW "async"
-        WHITESPACE " "
-        EXPR_STMT
-          RECORD_EXPR
-            PATH
-              PATH_SEGMENT
-                NAME_REF
-                  IDENT "gen"
-            WHITESPACE " "
-            RECORD_EXPR_FIELD_LIST
-              L_CURLY "{"
-              WHITESPACE " "
-              ERROR
-                YIELD_KW "yield"
-              WHITESPACE " "
-              ERROR
-                STRING "\"\""
-              ERROR
-                SEMICOLON ";"
-              WHITESPACE " "
-              R_CURLY "}"
-          SEMICOLON ";"
-        WHITESPACE "\n    "
-        EXPR_STMT
-          PATH_EXPR
-            PATH
-              PATH_SEGMENT
-                NAME_REF
-                  IDENT "gen"
-        WHITESPACE " "
-        EXPR_STMT
-          CLOSURE_EXPR
-            MOVE_KW "move"
-        WHITESPACE " "
-        EXPR_STMT
-          BLOCK_EXPR
-            STMT_LIST
-              L_CURLY "{"
-              WHITESPACE " "
-              EXPR_STMT
-                YIELD_EXPR
-                  YIELD_KW "yield"
-                  WHITESPACE " "
-                  LITERAL
-                    STRING "\"\""
-                SEMICOLON ";"
-              WHITESPACE " "
-              R_CURLY "}"
-          SEMICOLON ";"
-        WHITESPACE "\n    "
-        ERROR
-          ASYNC_KW "async"
-        WHITESPACE " "
-        EXPR_STMT
-          PATH_EXPR
-            PATH
-              PATH_SEGMENT
-                NAME_REF
-                  IDENT "gen"
-        WHITESPACE " "
-        EXPR_STMT
-          CLOSURE_EXPR
-            MOVE_KW "move"
-        WHITESPACE " "
-        EXPR_STMT
-          BLOCK_EXPR
-            STMT_LIST
-              L_CURLY "{"
-              WHITESPACE " "
-              EXPR_STMT
-                YIELD_EXPR
-                  YIELD_KW "yield"
-                  WHITESPACE " "
-                  LITERAL
-                    STRING "\"\""
-                SEMICOLON ";"
-              WHITESPACE " "
-              R_CURLY "}"
-          SEMICOLON ";"
-        WHITESPACE "\n"
-        R_CURLY "}"
-  WHITESPACE "\n"
-error 26: expected identifier
-error 31: expected COMMA
-error 32: expected identifier
-error 34: expected COMMA
-error 34: expected identifier
-error 48: expected fn, trait or impl
-error 55: expected identifier
-error 60: expected COMMA
-error 61: expected identifier
-error 63: expected COMMA
-error 63: expected identifier
-error 75: expected SEMICOLON
-error 80: expected `|`
-error 80: expected SEMICOLON
-error 105: expected fn, trait or impl
-error 109: expected SEMICOLON
-error 114: expected `|`
-error 114: expected SEMICOLON
diff --git a/crates/parser/test_data/parser/inline/ok/gen_blocks.rast b/crates/parser/test_data/parser/inline/ok/gen_blocks.rast
new file mode 100644
index 0000000000..6e8df9897e
--- /dev/null
+++ b/crates/parser/test_data/parser/inline/ok/gen_blocks.rast
@@ -0,0 +1,101 @@
+SOURCE_FILE
+  FN
+    COMMENT "// 2024"
+    WHITESPACE "\n"
+    VISIBILITY
+      PUB_KW "pub"
+    WHITESPACE " "
+    FN_KW "fn"
+    WHITESPACE " "
+    NAME
+      IDENT "main"
+    PARAM_LIST
+      L_PAREN "("
+      R_PAREN ")"
+    WHITESPACE " "
+    BLOCK_EXPR
+      STMT_LIST
+        L_CURLY "{"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          BLOCK_EXPR
+            GEN_KW "gen"
+            WHITESPACE " "
+            STMT_LIST
+              L_CURLY "{"
+              WHITESPACE " "
+              EXPR_STMT
+                YIELD_EXPR
+                  YIELD_KW "yield"
+                  WHITESPACE " "
+                  LITERAL
+                    STRING "\"\""
+                SEMICOLON ";"
+              WHITESPACE " "
+              R_CURLY "}"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          BLOCK_EXPR
+            ASYNC_KW "async"
+            WHITESPACE " "
+            GEN_KW "gen"
+            WHITESPACE " "
+            STMT_LIST
+              L_CURLY "{"
+              WHITESPACE " "
+              EXPR_STMT
+                YIELD_EXPR
+                  YIELD_KW "yield"
+                  WHITESPACE " "
+                  LITERAL
+                    STRING "\"\""
+                SEMICOLON ";"
+              WHITESPACE " "
+              R_CURLY "}"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          BLOCK_EXPR
+            GEN_KW "gen"
+            WHITESPACE " "
+            MOVE_KW "move"
+            WHITESPACE " "
+            STMT_LIST
+              L_CURLY "{"
+              WHITESPACE " "
+              EXPR_STMT
+                YIELD_EXPR
+                  YIELD_KW "yield"
+                  WHITESPACE " "
+                  LITERAL
+                    STRING "\"\""
+                SEMICOLON ";"
+              WHITESPACE " "
+              R_CURLY "}"
+          SEMICOLON ";"
+        WHITESPACE "\n    "
+        EXPR_STMT
+          BLOCK_EXPR
+            ASYNC_KW "async"
+            WHITESPACE " "
+            GEN_KW "gen"
+            WHITESPACE " "
+            MOVE_KW "move"
+            WHITESPACE " "
+            STMT_LIST
+              L_CURLY "{"
+              WHITESPACE " "
+              EXPR_STMT
+                YIELD_EXPR
+                  YIELD_KW "yield"
+                  WHITESPACE " "
+                  LITERAL
+                    STRING "\"\""
+                SEMICOLON ";"
+              WHITESPACE " "
+              R_CURLY "}"
+          SEMICOLON ";"
+        WHITESPACE "\n"
+        R_CURLY "}"
+  WHITESPACE "\n"
diff --git a/crates/parser/test_data/parser/inline/err/gen_blocks.rs b/crates/parser/test_data/parser/inline/ok/gen_blocks.rs
similarity index 94%
rename from crates/parser/test_data/parser/inline/err/gen_blocks.rs
rename to crates/parser/test_data/parser/inline/ok/gen_blocks.rs
index f7687331d6..669b434973 100644
--- a/crates/parser/test_data/parser/inline/err/gen_blocks.rs
+++ b/crates/parser/test_data/parser/inline/ok/gen_blocks.rs
@@ -1,3 +1,4 @@
+// 2024
 pub fn main() {
     gen { yield ""; };
     async gen { yield ""; };
diff --git a/xtask/src/codegen/parser_inline_tests.rs b/xtask/src/codegen/parser_inline_tests.rs
index 3a9073b4e4..f9f73df8eb 100644
--- a/xtask/src/codegen/parser_inline_tests.rs
+++ b/xtask/src/codegen/parser_inline_tests.rs
@@ -34,38 +34,60 @@ pub(crate) fn generate(check: bool) {
         install_tests(&tests.err, &format!("{PARSER_TEST_DATA_INLINE}/err"), check).unwrap();
 
     if some_file_was_updated {
-        let _ = fs::File::open(&format!("{PARSER_CRATE_ROOT}/src/tests.rs"))
+        let _ = fs::File::open(format!("{PARSER_CRATE_ROOT}/src/tests.rs"))
             .unwrap()
             .set_modified(SystemTime::now());
 
-        let ok_tests = tests.ok.keys().sorted().map(|k| {
-            let test_name = quote::format_ident!("{}", k);
+        let ok_tests = tests.ok.values().sorted_by(|a, b| a.name.cmp(&b.name)).map(|test| {
+            let test_name = quote::format_ident!("{}", test.name);
             let test_file = format!("test_data/parser/inline/ok/{test_name}.rs");
+            let (test_func, args) = match &test.edition {
+                Some(edition) => {
+                    let edition = quote::format_ident!("Edition{edition}");
+                    (
+                        quote::format_ident!("run_and_expect_no_errors_with_edition"),
+                        quote::quote! {#test_file, crate::Edition::#edition},
+                    )
+                }
+                None => {
+                    (quote::format_ident!("run_and_expect_no_errors"), quote::quote! {#test_file})
+                }
+            };
             quote::quote! {
                 #[test]
                 fn #test_name() {
-                    run_and_expect_no_errors(#test_file);
+                    #test_func(#args);
                 }
             }
         });
-        let err_tests = tests.err.keys().sorted().map(|k| {
-            let test_name = quote::format_ident!("{}", k);
+        let err_tests = tests.err.values().sorted_by(|a, b| a.name.cmp(&b.name)).map(|test| {
+            let test_name = quote::format_ident!("{}", test.name);
             let test_file = format!("test_data/parser/inline/err/{test_name}.rs");
+            let (test_func, args) = match &test.edition {
+                Some(edition) => {
+                    let edition = quote::format_ident!("Edition{edition}");
+                    (
+                        quote::format_ident!("run_and_expect_errors_with_edition"),
+                        quote::quote! {#test_file, crate::Edition::#edition},
+                    )
+                }
+                None => (quote::format_ident!("run_and_expect_errors"), quote::quote! {#test_file}),
+            };
             quote::quote! {
                 #[test]
                 fn #test_name() {
-                    run_and_expect_errors(#test_file);
+                    #test_func(#args);
                 }
             }
         });
 
         let output = quote::quote! {
             mod ok {
-                use crate::tests::run_and_expect_no_errors;
+                use crate::tests::*;
                 #(#ok_tests)*
             }
             mod err {
-                use crate::tests::run_and_expect_errors;
+                use crate::tests::*;
                 #(#err_tests)*
             }
         };
@@ -107,9 +129,10 @@ fn install_tests(tests: &HashMap<String, Test>, into: &str, check: bool) -> Resu
 
 #[derive(Debug)]
 struct Test {
-    pub name: String,
-    pub text: String,
-    pub kind: TestKind,
+    name: String,
+    text: String,
+    kind: TestKind,
+    edition: Option<String>,
 }
 
 #[derive(Copy, Clone, Debug)]
@@ -120,8 +143,8 @@ enum TestKind {
 
 #[derive(Default, Debug)]
 struct Tests {
-    pub ok: HashMap<String, Test>,
-    pub err: HashMap<String, Test>,
+    ok: HashMap<String, Test>,
+    err: HashMap<String, Test>,
 }
 
 fn collect_tests(s: &str) -> Vec<Test> {
@@ -135,14 +158,24 @@ fn collect_tests(s: &str) -> Vec<Test> {
         } else {
             continue;
         };
-        let text: String = comment_block.contents[1..]
-            .iter()
-            .cloned()
+        let (name, edition) = match *name.split(' ').collect_vec().as_slice() {
+            [name, edition] => {
+                assert!(!edition.contains(' '));
+                (name.to_owned(), Some(edition.to_owned()))
+            }
+            [name] => (name.to_owned(), None),
+            _ => panic!("invalid test name: {:?}", name),
+        };
+        let text: String = edition
+            .as_ref()
+            .map(|edition| format!("// {edition}"))
+            .into_iter()
+            .chain(comment_block.contents[1..].iter().cloned())
             .chain(iter::once(String::new()))
             .collect::<Vec<_>>()
             .join("\n");
         assert!(!text.trim().is_empty() && text.ends_with('\n'));
-        res.push(Test { name, text, kind })
+        res.push(Test { name, edition, text, kind })
     }
     res
 }
@@ -180,7 +213,9 @@ fn existing_tests(dir: &Path, ok: TestKind) -> Result<HashMap<String, (PathBuf,
         if rust_file {
             let name = path.file_stem().map(|x| x.to_string_lossy().to_string()).unwrap();
             let text = fs::read_to_string(&path)?;
-            let test = Test { name: name.clone(), text, kind: ok };
+            let edition =
+                text.lines().next().and_then(|it| it.strip_prefix("// ")).map(ToOwned::to_owned);
+            let test = Test { name: name.clone(), text, kind: ok, edition };
             if let Some(old) = res.insert(name, (path, test)) {
                 println!("Duplicate test: {:?}", old);
             }