Squashed 'subprojects/thiserror/' content from commit 247eab5

git-subtree-dir: subprojects/thiserror
git-subtree-split: 247eab5d79e27ad28859afdf8bc600a4242829b7

tests/ui/raw-identifier.rs

@@ -0,0 +1,12 @@
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+#[error("error: {r#fn}")]
+pub struct Error {
+    r#fn: &'static str,
+}
+
+fn main() {
+    let r#fn = "...";
+    let _ = format!("error: {r#fn}");
+}