1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/macros/macro-backtrace-println.rs b/tests/ui/macros/macro-backtrace-println.rs
new file mode 100644
index 000000000..859dd019d
--- /dev/null
+++ b/tests/ui/macros/macro-backtrace-println.rs
@@ -0,0 +1,19 @@
+// The `format_args!` syntax extension issues errors before code expansion
+// has completed, but we still need a backtrace.
+
+// This test includes stripped-down versions of `print!` and `println!`,
+// because we can't otherwise verify the lines of the backtrace.
+
+fn print(_args: std::fmt::Arguments) {}
+
+macro_rules! myprint {
+    ($($arg:tt)*) => (print(format_args!($($arg)*)));
+}
+
+macro_rules! myprintln {
+    ($fmt:expr) => (myprint!(concat!($fmt, "\n"))); //~ ERROR no arguments were given
+}
+
+fn main() {
+    myprintln!("{}");
+}