From 01850584a38490713ee70f8f6b92e04f5bc4d6d1 Mon Sep 17 00:00:00 2001
From: Reese Williams <reese@reesew.io>
Date: Thu, 11 Jun 2026 09:47:37 -0500
Subject: [PATCH 1/2] Fixtures

---
 fixtures/small/anonymous_blockarg_actual.rb   | 22 +++++++++++++++++++
 fixtures/small/anonymous_blockarg_expected.rb | 22 +++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/fixtures/small/anonymous_blockarg_actual.rb b/fixtures/small/anonymous_blockarg_actual.rb
index 2ce2f4ad6..4d1fce92e 100644
--- a/fixtures/small/anonymous_blockarg_actual.rb
+++ b/fixtures/small/anonymous_blockarg_actual.rb
@@ -1,3 +1,25 @@
 def foo(a, b, &)
   bar a, b, &
 end
+
+def foo(
+  a,
+  &
+)
+  bar(
+    a,
+  &)
+end
+
+def foo(
+  a,
+  *b,
+  &
+)
+bar(
+    a,
+    b,
+    &
+  )
+end
+
diff --git a/fixtures/small/anonymous_blockarg_expected.rb b/fixtures/small/anonymous_blockarg_expected.rb
index 741c607a2..2f24638a1 100644
--- a/fixtures/small/anonymous_blockarg_expected.rb
+++ b/fixtures/small/anonymous_blockarg_expected.rb
@@ -1,3 +1,25 @@
 def foo(a, b, &)
   bar(a, b, &)
 end
+
+def foo(
+  a,
+  &
+)
+  bar(
+    a,
+    &
+  )
+end
+
+def foo(
+  a,
+  *b,
+  &
+)
+  bar(
+    a,
+    b,
+    &
+  )
+end

From 9202b881487b5270882bbe81ddac2fdc902bf3f6 Mon Sep 17 00:00:00 2001
From: Reese Williams <reese@reesew.io>
Date: Thu, 11 Jun 2026 09:52:17 -0500
Subject: [PATCH 2/2] Emit `at_offset` for anonymous block args

---
 librubyfmt/src/format_prism.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/librubyfmt/src/format_prism.rs b/librubyfmt/src/format_prism.rs
index d27e4bf61..0b2b1b8ce 100644
--- a/librubyfmt/src/format_prism.rs
+++ b/librubyfmt/src/format_prism.rs
@@ -1639,6 +1639,8 @@ fn format_block_parameter_node<'src>(
             let ident_str = ident.as_slice();
             ps.bind_variable(ident_str);
             handle_string_at_offset(ps, ident_str, block_arg.name_loc().unwrap().end_offset());
+        } else {
+            ps.at_offset(block_arg.location().start_offset());
         }
     });
 }