Always suggest as `MachineApplicable` in `recover_intersection_pat`

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/test/ui/parser/intersection-patterns-2.rs b/src/test/ui/parser/intersection-patterns-2.rs
new file mode 100644
index 00000000000..408415e87ef
--- /dev/null
+++ b/src/test/ui/parser/intersection-patterns-2.rs
@@ -0,0 +1,20 @@
+// This tests the parser recovery in `recover_intersection_pat`
+// and serves as a regression test for the diagnostics issue #65400.
+//
+// The general idea is that for `$pat_lhs @ $pat_rhs` where
+// `$pat_lhs` is not generated by `ref? mut? $ident` we want
+// to suggest either switching the order or note that intersection
+// patterns are not allowed.
+
+fn main() {
+    let s: Option<u8> = None;
+
+    match s {
+        Some(x) @ Some(y) => {}
+        //~^ ERROR left-hand side of `@` must be a binding
+        //~| interpreted as a pattern, not a binding
+        //~| also a pattern
+        //~| NOTE bindings are `x`, `mut x`, `ref x`, and `ref mut x`
+        _ => {}
+    }
+}