Fix #78549

Before #78430, string literals worked because `specialize_constructor`
didn't actually care too much which constructor was passed to it unless
needed. Since then, string literals are special cased and a bit hacky. I
did not anticipate patterns for the `&str` type other than string
literals, hence this bug. This makes string literals less hacky.

1 files changed, 25 insertions, 0 deletions

diff --git a/src/test/ui/pattern/usefulness/issue-78549-ref-pat-and-str.rs b/src/test/ui/pattern/usefulness/issue-78549-ref-pat-and-str.rs
new file mode 100644
index 00000000000..2879caf2c4c
--- /dev/null
+++ b/src/test/ui/pattern/usefulness/issue-78549-ref-pat-and-str.rs
@@ -0,0 +1,25 @@
+// check-pass
+// From https://github.com/rust-lang/rust/issues/78549
+
+fn main() {
+    match "foo" {
+        "foo" => {},
+        &_ => {},
+    }
+
+    match "foo" {
+        &_ => {},
+        "foo" => {},
+    }
+
+    match ("foo", 0, "bar") {
+        (&_, 0, &_) => {},
+        ("foo", _, "bar") => {},
+        (&_, _, &_) => {},
+    }
+
+    match (&"foo", "bar") {
+        (&"foo", &_) => {},
+        (&&_, &_) => {},
+    }
+}