Rollup merge of #67546 - oli-obk:slice_pattern_ice, r=varkor

Fix ICE in mir interpretation

Indices from the end start at 1 so you can immediately subtract them from the length to get the index instead of having to do an additional `-1`. Kinda documented in https://doc.rust-lang.org/nightly/nightly-rustc/rustc/mir/enum.ProjectionElem.html#variant.ConstantIndex

1 files changed, 9 insertions, 0 deletions

diff --git a/src/test/ui/consts/const_prop_slice_pat_ice.rs b/src/test/ui/consts/const_prop_slice_pat_ice.rs
new file mode 100644
index 00000000000..5fec36e44bd
--- /dev/null
+++ b/src/test/ui/consts/const_prop_slice_pat_ice.rs
@@ -0,0 +1,9 @@
+// check-pass
+#![feature(slice_patterns)]
+
+fn main() {
+    match &[0, 1] as &[i32] {
+        [a @ .., x] => {}
+        &[] => {}
+    }
+}