1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/rust-2021/reserved-prefixes-migration.rs b/src/test/ui/rust-2021/reserved-prefixes-migration.rs
new file mode 100644
index 000000000..0565db793
--- /dev/null
+++ b/src/test/ui/rust-2021/reserved-prefixes-migration.rs
@@ -0,0 +1,38 @@
+// check-pass
+// run-rustfix
+// edition:2018
+
+#![warn(rust_2021_prefixes_incompatible_syntax)]
+
+macro_rules! m2 {
+    ($a:tt $b:tt) => {};
+}
+
+macro_rules! m3 {
+    ($a:tt $b:tt $c:tt) => {};
+}
+
+fn main() {
+    m2!(z"hey");
+    //~^ WARNING prefix `z` is unknown [rust_2021_prefixes_incompatible_syntax]
+    //~| WARNING hard error in Rust 2021
+    m2!(prefix"hey");
+    //~^ WARNING prefix `prefix` is unknown [rust_2021_prefixes_incompatible_syntax]
+    //~| WARNING hard error in Rust 2021
+    m3!(hey#123);
+    //~^ WARNING prefix `hey` is unknown [rust_2021_prefixes_incompatible_syntax]
+    //~| WARNING hard error in Rust 2021
+    m3!(hey#hey);
+    //~^ WARNING prefix `hey` is unknown [rust_2021_prefixes_incompatible_syntax]
+    //~| WARNING hard error in Rust 2021
+}
+
+macro_rules! quote {
+    (# name = # kind # value) => {};
+}
+
+quote! {
+    #name = #kind#value
+    //~^ WARNING prefix `kind` is unknown [rust_2021_prefixes_incompatible_syntax]
+    //~| WARNING hard error in Rust 2021
+}