Add error for pattern-matching on arrays without a fixed size

2 files changed, 26 insertions, 0 deletions

diff --git a/src/test/ui/error-codes/E0730.rs b/src/test/ui/error-codes/E0730.rs
new file mode 100644
index 00000000000..e5048d6e6e3
--- /dev/null
+++ b/src/test/ui/error-codes/E0730.rs
@@ -0,0 +1,11 @@
+#![feature(const_generics)]
+//~^ WARN the feature `const_generics` is incomplete and may cause the compiler to crash
+
+fn is_123<const N: usize>(x: [u32; N]) -> bool {
+    match x {
+        [1, 2, 3] => true, //~ ERROR cannot pattern-match on an array without a fixed length
+        _ => false
+    }
+}
+
+fn main() {}
diff --git a/src/test/ui/error-codes/E0730.stderr b/src/test/ui/error-codes/E0730.stderr
new file mode 100644
index 00000000000..f9281262bb7
--- /dev/null
+++ b/src/test/ui/error-codes/E0730.stderr
@@ -0,0 +1,15 @@
+warning: the feature `const_generics` is incomplete and may cause the compiler to crash
+  --> $DIR/E0730.rs:1:12
+   |
+LL | #![feature(const_generics)]
+   |            ^^^^^^^^^^^^^^
+
+error[E0730]: cannot pattern-match on an array without a fixed length
+  --> $DIR/E0730.rs:6:9
+   |
+LL |         [1, 2, 3] => true,
+   |         ^^^^^^^^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0730`.