1 files changed, 25 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/target/issue-3840/version-one_hard-tabs.rs b/src/tools/rustfmt/tests/target/issue-3840/version-one_hard-tabs.rs
new file mode 100644
index 000000000..4aa905ce9
--- /dev/null
+++ b/src/tools/rustfmt/tests/target/issue-3840/version-one_hard-tabs.rs
@@ -0,0 +1,25 @@
+// rustfmt-hard_tabs: true
+
+impl<
+		Target: FromEvent<A> + FromEvent<B>,
+		A: Widget2<Ctx = C>,
+		B: Widget2<Ctx = C>,
+		C: for<'a> CtxFamily<'a>,
+	> Widget2 for WidgetEventLifter<Target, A, B>
+{
+	type Ctx = C;
+	type Event = Vec<Target>;
+}
+
+mod foo {
+	impl<
+			Target: FromEvent<A> + FromEvent<B>,
+			A: Widget2<Ctx = C>,
+			B: Widget2<Ctx = C>,
+			C: for<'a> CtxFamily<'a>,
+		> Widget2 for WidgetEventLifter<Target, A, B>
+	{
+		type Ctx = C;
+		type Event = Vec<Target>;
+	}
+}