Rollup merge of #144403 - Kivooeo:issue4, r=jieyouxu

`tests/ui/issues/`: The Issues Strike Back [4/N]

Some `tests/ui/issues/` housekeeping, to trim down number of tests directly under `tests/ui/issues/`. Part of https://github.com/rust-lang/rust/issues/133895.

r? ````````@jieyouxu````````

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/ui/pattern/enum-struct-pattern-mismatch-15896.rs b/tests/ui/pattern/enum-struct-pattern-mismatch-15896.rs
new file mode 100644
index 00000000000..9f7c5084c0e
--- /dev/null
+++ b/tests/ui/pattern/enum-struct-pattern-mismatch-15896.rs
@@ -0,0 +1,17 @@
+//! Regression test for https://github.com/rust-lang/rust/issues/15896
+
+// Regression test for #15896. It used to ICE rustc.
+
+fn main() {
+    enum R { REB(()) }
+    struct Tau { t: usize }
+    enum E { B(R, Tau) }
+
+    let e = E::B(R::REB(()), Tau { t: 3 });
+    let u = match e {
+        E::B(
+          Tau{t: x},
+          //~^ ERROR mismatched types
+          _) => x,
+    };
+}