1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/fmt/format-expanded-string.rs b/tests/ui/fmt/format-expanded-string.rs
new file mode 100644
index 000000000..4c716f08c
--- /dev/null
+++ b/tests/ui/fmt/format-expanded-string.rs
@@ -0,0 +1,24 @@
+// aux-build:format-string-proc-macro.rs
+
+#[macro_use]
+extern crate format_string_proc_macro;
+
+
+// If the format string is another macro invocation, rustc would previously
+// compute nonsensical spans, such as:
+//
+//   error: invalid format string: unmatched `}` found
+//    --> test.rs:2:17
+//     |
+//   2 |     format!(concat!("abc}"));
+//     |                 ^ unmatched `}` in format string
+//
+// This test checks that this behavior has been fixed.
+
+fn main() {
+    format!(concat!("abc}"));
+    //~^ ERROR: invalid format string: unmatched `}` found
+
+    format!(err_with_input_span!(""));
+    //~^ ERROR: invalid format string: unmatched `}` found
+}