1 files changed, 62 insertions, 0 deletions
diff --git a/tests/ui/rfc-2497-if-let-chains/feature-gate.rs b/tests/ui/rfc-2497-if-let-chains/feature-gate.rs
new file mode 100644
index 00000000000..2b407ef510c
--- /dev/null
+++ b/tests/ui/rfc-2497-if-let-chains/feature-gate.rs
@@ -0,0 +1,62 @@
+// gate-test-let_chains
+
+// Here we test feature gating for ´let_chains`.
+// See `disallowed-positions.rs` for the grammar
+// defining the language for gated allowed positions.
+
+#![allow(irrefutable_let_patterns)]
+
+use std::ops::Range;
+
+fn _if() {
+    if let 0 = 1 {} // Stable!
+
+    if true && let 0 = 1 {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+
+    if let 0 = 1 && true {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+
+    if let Range { start: _, end: _ } = (true..true) && false {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+
+    if let 1 = 1 && let true = { true } && false {
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~| ERROR `let` expressions in this position are unstable [E0658]
+    }
+}
+
+fn _while() {
+    while let 0 = 1 {} // Stable!
+
+    while true && let 0 = 1 {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+
+    while let 0 = 1 && true {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+
+    while let Range { start: _, end: _ } = (true..true) && false {}
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+}
+
+fn _macros() {
+    macro_rules! noop_expr { ($e:expr) => {}; }
+
+    noop_expr!((let 0 = 1));
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~| ERROR expected expression, found `let` statement
+
+    macro_rules! use_expr {
+        ($e:expr) => {
+            if $e {}
+            while $e {}
+        }
+    }
+    #[cfg(FALSE)] (let 0 = 1);
+    //~^ ERROR `let` expressions in this position are unstable [E0658]
+    //~| ERROR expected expression, found `let` statement
+    use_expr!(let 0 = 1);
+    //~^ ERROR no rules expected the token `let`
+}
+
+fn main() {}