diff --git a/gdtoolkit/formatter/expression.py b/gdtoolkit/formatter/expression.py
index e179eab1..abc502e0 100644
--- a/gdtoolkit/formatter/expression.py
+++ b/gdtoolkit/formatter/expression.py
@@ -151,6 +151,7 @@ def _format_foldable_to_multiple_lines(
         "c_dict_element": _format_kv_pair_to_multiple_lines,
         "eq_dict_element": _format_kv_pair_to_multiple_lines,
         "lambda": _format_lambda_to_multiple_lines,
+        "lambda_header": _format_lambda_header_to_multiple_lines,
         # fake expressions:
         "func_args": _format_args_to_multiple_lines,
         "func_arg_regular": _format_func_arg_to_multiple_lines,
diff --git a/gdtoolkit/parser/gdscript_indenter.py b/gdtoolkit/parser/gdscript_indenter.py
index 62605ca6..5ce8d416 100644
--- a/gdtoolkit/parser/gdscript_indenter.py
+++ b/gdtoolkit/parser/gdscript_indenter.py
@@ -40,7 +40,9 @@ def handle_NL(self, token: Token) -> Iterator[Token]:
         else:
             while indent < self.indent_level[-1]:
                 self.indent_level.pop()
-                yield Token.new_borrow_pos(self.DEDENT_type, indent_str, token)
+                yield Token(
+                    self.DEDENT_type, indent_str, None, token.line, None, token.line
+                )
                 # produce extra newline after dedent to simplify grammar:
                 yield token
 
diff --git a/tests/formatter/input-output-pairs/long_unistatement_lambdas.in.gd b/tests/formatter/input-output-pairs/long_unistatement_lambdas.in.gd
new file mode 100644
index 00000000..821021d5
--- /dev/null
+++ b/tests/formatter/input-output-pairs/long_unistatement_lambdas.in.gd
@@ -0,0 +1,15 @@
+func xyz(x):
+	pass
+func foo():
+	var x1 = func(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): pass
+	var x2 = func(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23) -> int: return 1
+	var x3 = func bar(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): pass
+	var x4 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23) -> int: return 1
+
+	var x5 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): return [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+	var x6 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): xyz([0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0])
+	var x8 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): var xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+	var x9 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): var x=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+	var x10 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): var xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:int
+	var x11 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): var x:Array=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+	var x12 = func baz(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10,p11,p12,p13,p14,p15,p16,p17,p18,p19,p20,p21,p22,p23): var x:=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
diff --git a/tests/formatter/input-output-pairs/long_unistatement_lambdas.out.gd b/tests/formatter/input-output-pairs/long_unistatement_lambdas.out.gd
new file mode 100644
index 00000000..b5f920c8
--- /dev/null
+++ b/tests/formatter/input-output-pairs/long_unistatement_lambdas.out.gd
@@ -0,0 +1,494 @@
+func xyz(x):
+	pass
+
+
+func foo():
+	var x1 = func(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		pass
+	var x2 = func(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	) -> int:
+		return 1
+	var x3 = func bar(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		pass
+	var x4 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	) -> int:
+		return 1
+
+	var x5 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		return [
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0
+		]
+	var x6 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		xyz(
+			[
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0,
+				0
+			]
+		)
+	var x8 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		var xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+	var x9 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		var x = [
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0
+		]
+	var x10 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		var xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx: int
+	var x11 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		var x: Array = [
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0
+		]
+	var x12 = func baz(
+		p1,
+		p2,
+		p3,
+		p4,
+		p5,
+		p6,
+		p7,
+		p8,
+		p9,
+		p10,
+		p11,
+		p12,
+		p13,
+		p14,
+		p15,
+		p16,
+		p17,
+		p18,
+		p19,
+		p20,
+		p21,
+		p22,
+		p23
+	):
+		var x := [
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0,
+			0
+		]
diff --git a/tests/formatter/input-output-pairs/simple_multistatement_lambdas.in.gd b/tests/formatter/input-output-pairs/simple_multistatement_lambdas.in.gd
index 47f52a6d..604c3d94 100644
--- a/tests/formatter/input-output-pairs/simple_multistatement_lambdas.in.gd
+++ b/tests/formatter/input-output-pairs/simple_multistatement_lambdas.in.gd
@@ -16,3 +16,5 @@ func baz():
 				return 5
 			return 6
 		return 7
+
+	pass
diff --git a/tests/formatter/input-output-pairs/simple_multistatement_lambdas.out.gd b/tests/formatter/input-output-pairs/simple_multistatement_lambdas.out.gd
index 38cd2847..584018a6 100644
--- a/tests/formatter/input-output-pairs/simple_multistatement_lambdas.out.gd
+++ b/tests/formatter/input-output-pairs/simple_multistatement_lambdas.out.gd
@@ -23,3 +23,5 @@ func baz():
 				return 5
 			return 6
 		return 7
+
+	pass