diff --git a/clippy_lints/src/write.rs b/clippy_lints/src/write.rs
index 7ddae1c81c7e..69d99cc60f41 100644
--- a/clippy_lints/src/write.rs
+++ b/clippy_lints/src/write.rs
@@ -284,7 +284,6 @@ fn check_tts<'a>(cx: &EarlyContext<'a>, tts: &ThinTokenStream, is_write: bool) -
     let mut idx = 0;
     loop {
         if !parser.eat(&token::Comma) {
-            assert!(parser.eat(&token::Eof));
             return (Some(fmtstr), expr);
         }
         let token_expr = match parser.parse_expr().map_err(|mut err| err.cancel()) {
diff --git a/tests/ui/issue-3145.rs b/tests/ui/issue-3145.rs
new file mode 100644
index 000000000000..f497d5550af5
--- /dev/null
+++ b/tests/ui/issue-3145.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("{}" a); //~ERROR expected token: `,`
+}
diff --git a/tests/ui/issue-3145.stderr b/tests/ui/issue-3145.stderr
new file mode 100644
index 000000000000..e289df043a39
--- /dev/null
+++ b/tests/ui/issue-3145.stderr
@@ -0,0 +1,8 @@
+error: expected token: `,`
+ --> $DIR/issue-3145.rs:2:19
+  |
+2 |     println!("{}" a); //~ERROR expected token: `,`
+  |                   ^
+
+error: aborting due to previous error
+