Suppress erroneous suggestion

The suggestion to use `let else` with an uninitialized refutable `let`
statement was erroneous: `let else` cannot be used with deferred
initialization.

2 files changed, 21 insertions, 0 deletions

diff --git a/tests/ui/let-else/uninitialized-refutable-let-issue-123844.rs b/tests/ui/let-else/uninitialized-refutable-let-issue-123844.rs
new file mode 100644
index 00000000000..8426b0021f4
--- /dev/null
+++ b/tests/ui/let-else/uninitialized-refutable-let-issue-123844.rs
@@ -0,0 +1,8 @@
+// https://github.com/rust-lang/rust/issues/123844
+// An uninitialized refutable let should not suggest `let else`, as it can't be used with deferred
+// initialization.
+
+fn main() {
+    let Some(x); //~ ERROR refutable pattern in local binding
+    x = 1;
+}
diff --git a/tests/ui/let-else/uninitialized-refutable-let-issue-123844.stderr b/tests/ui/let-else/uninitialized-refutable-let-issue-123844.stderr
new file mode 100644
index 00000000000..13312306c07
--- /dev/null
+++ b/tests/ui/let-else/uninitialized-refutable-let-issue-123844.stderr
@@ -0,0 +1,13 @@
+error[E0005]: refutable pattern in local binding
+  --> $DIR/uninitialized-refutable-let-issue-123844.rs:6:9
+   |
+LL |     let Some(x);
+   |         ^^^^^^^ pattern `None` not covered
+   |
+   = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
+   = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
+   = note: the matched value is of type `Option<i32>`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0005`.