From 76ea56667703ac06689ff1d6fba5d170fa7392a7 Mon Sep 17 00:00:00 2001
From: est31 <MTest31@outlook.com>
Date: Mon, 21 Feb 2022 08:27:24 +0100
Subject: Better error if the user tries to do assignment ... else

---
 src/test/ui/let-else/let-else-destructuring.rs     | 18 ++++++++++++++++++
 src/test/ui/let-else/let-else-destructuring.stderr | 17 +++++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 src/test/ui/let-else/let-else-destructuring.rs
 create mode 100644 src/test/ui/let-else/let-else-destructuring.stderr

(limited to 'src/test/ui')

diff --git a/src/test/ui/let-else/let-else-destructuring.rs b/src/test/ui/let-else/let-else-destructuring.rs
new file mode 100644
index 00000000000..9a09c414ac8
--- /dev/null
+++ b/src/test/ui/let-else/let-else-destructuring.rs
@@ -0,0 +1,18 @@
+#![feature(let_else)]
+#[derive(Debug)]
+enum Foo {
+    Done,
+    Nested(Option<&'static Foo>),
+}
+
+fn walk(mut value: &Foo) {
+    loop {
+        println!("{:?}", value);
+        &Foo::Nested(Some(value)) = value else { break }; //~ ERROR invalid left-hand side of assignment
+        //~^ERROR <assignment> ... else { ... } is not allowed
+    }
+}
+
+fn main() {
+    walk(&Foo::Done);
+}
diff --git a/src/test/ui/let-else/let-else-destructuring.stderr b/src/test/ui/let-else/let-else-destructuring.stderr
new file mode 100644
index 00000000000..95efb711682
--- /dev/null
+++ b/src/test/ui/let-else/let-else-destructuring.stderr
@@ -0,0 +1,17 @@
+error: <assignment> ... else { ... } is not allowed
+  --> $DIR/let-else-destructuring.rs:11:9
+   |
+LL |         &Foo::Nested(Some(value)) = value else { break };
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0070]: invalid left-hand side of assignment
+  --> $DIR/let-else-destructuring.rs:11:35
+   |
+LL |         &Foo::Nested(Some(value)) = value else { break };
+   |         ------------------------- ^
+   |         |
+   |         cannot assign to this expression
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0070`.
-- 
cgit 1.4.1-3-g733a5