1 files changed, 15 insertions, 0 deletions
diff --git a/src/tools/rustfmt/tests/target/issue-4577.rs b/src/tools/rustfmt/tests/target/issue-4577.rs
new file mode 100644
index 000000000..1bd9eb6b8
--- /dev/null
+++ b/src/tools/rustfmt/tests/target/issue-4577.rs
@@ -0,0 +1,15 @@
+fn main() {
+    let s: String = "ABAABBAA"
+        .chars()
+        .filter(|c| if *c == 'A' { true } else { false })
+        .map(|c| -> char {
+            if c == 'A' {
+                '0'
+            } else {
+                '1'
+            }
+        })
+        .collect();
+
+    println!("{}", s);
+}