1 files changed, 34 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-mutate-in-guard.rs b/tests/ui/borrowck/borrowck-mutate-in-guard.rs
new file mode 100644
index 000000000..d80a9e815
--- /dev/null
+++ b/tests/ui/borrowck/borrowck-mutate-in-guard.rs
@@ -0,0 +1,34 @@
+#![feature(if_let_guard)]
+
+enum Enum<'a> {
+    A(&'a isize),
+    B(bool),
+}
+
+fn if_guard() -> isize {
+    let mut n = 42;
+    let mut x = Enum::A(&mut n);
+    match x {
+        Enum::A(_) if { x = Enum::B(false); false } => 1,
+        //~^ ERROR cannot assign `x` in match guard
+        Enum::A(_) if { let y = &mut x; *y = Enum::B(false); false } => 1,
+        //~^ ERROR cannot mutably borrow `x` in match guard
+        Enum::A(p) => *p,
+        Enum::B(_) => 2,
+    }
+}
+
+fn if_let_guard() -> isize {
+    let mut n = 42;
+    let mut x = Enum::A(&mut n);
+    match x {
+        Enum::A(_) if let Some(()) = { x = Enum::B(false); None } => 1,
+        //~^ ERROR cannot assign `x` in match guard
+        Enum::A(_) if let Some(()) = { let y = &mut x; *y = Enum::B(false); None } => 1,
+        //~^ ERROR cannot mutably borrow `x` in match guard
+        Enum::A(p) => *p,
+        Enum::B(_) => 2,
+    }
+}
+
+fn main() {}