1 files changed, 55 insertions, 0 deletions
diff --git a/tests/ui/fmt/format-string-error.rs b/tests/ui/fmt/format-string-error.rs
new file mode 100644
index 00000000000..eae4f3cb547
--- /dev/null
+++ b/tests/ui/fmt/format-string-error.rs
@@ -0,0 +1,55 @@
+// ignore-tidy-tab
+
+fn main() {
+    println!("{");
+    //~^ ERROR invalid format string: expected `'}'` but string was terminated
+    println!("{{}}");
+    println!("}");
+    //~^ ERROR invalid format string: unmatched `}` found
+    let _ = format!("{_}", _ = 6usize);
+    //~^ ERROR invalid format string: invalid argument name `_`
+    let _ = format!("{a:_}", a = "", _ = 0);
+    //~^ ERROR invalid format string: invalid argument name `_`
+    let _ = format!("{a:._$}", a = "", _ = 0);
+    //~^ ERROR invalid format string: invalid argument name `_`
+    let _ = format!("{");
+    //~^ ERROR invalid format string: expected `'}'` but string was terminated
+    let _ = format!("}");
+    //~^ ERROR invalid format string: unmatched `}` found
+    let _ = format!("{\\}");
+    //~^ ERROR invalid format string: expected `'}'`, found `'\\'`
+    let _ = format!("\n\n\n{\n\n\n");
+    //~^ ERROR invalid format string
+    let _ = format!(r###"
+
+
+
+	{"###);
+    //~^ ERROR invalid format string
+    let _ = format!(r###"
+
+
+
+	{
+
+"###);
+    //~^ ERROR invalid format string
+    let _ = format!(r###"
+
+
+
+	}
+
+"###);
+    //~^^^ ERROR invalid format string
+    let _ = format!(r###"
+
+
+
+        }
+
+"###);
+    //~^^^ ERROR invalid format string: unmatched `}` found
+    println!("{} {} {}", 1, 2);
+    //~^ ERROR 3 positional arguments in format string, but there are 2 arguments
+}