1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/macros/missing-writer.rs b/tests/ui/macros/missing-writer.rs
new file mode 100644
index 000000000..7df965c36
--- /dev/null
+++ b/tests/ui/macros/missing-writer.rs
@@ -0,0 +1,17 @@
+// Check error for missing writer in writeln! and write! macro
+fn main() {
+    let x = 1;
+    let y = 2;
+    write!("{}_{}", x, y);
+    //~^ ERROR format argument must be a string literal
+    //~| HELP you might be missing a string literal to format with
+    //~| ERROR cannot write into `&'static str`
+    //~| NOTE must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
+    //~| HELP a writer is needed before this format string
+    writeln!("{}_{}", x, y);
+    //~^ ERROR format argument must be a string literal
+    //~| HELP you might be missing a string literal to format with
+    //~| ERROR cannot write into `&'static str`
+    //~| NOTE must implement `io::Write`, `fmt::Write`, or have a `write_fmt` method
+    //~| HELP a writer is needed before this format string
+}