From 1d0b729f28dd5f9341c4f4fe8ab4b25592e6834a Mon Sep 17 00:00:00 2001
From: Veikka Tuominen <git@vexu.eu>
Date: Wed, 24 Aug 2022 20:29:13 +0300
Subject: [PATCH] Sema: fix crash on slice of non-array type

Closes #12621
---
 src/Sema.zig                                          | 3 ++-
 test/cases/compile_errors/slice_of_non_array_type.zig | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 test/cases/compile_errors/slice_of_non_array_type.zig

diff --git a/src/Sema.zig b/src/Sema.zig
index 846b6af3bd..4e1b885486 100644
--- a/src/Sema.zig
+++ b/src/Sema.zig
@@ -26139,11 +26139,12 @@ fn analyzeSlice(
     var array_ty = ptr_ptr_child_ty;
     var slice_ty = ptr_ptr_ty;
     var ptr_or_slice = ptr_ptr;
-    var elem_ty = ptr_ptr_child_ty.childType();
+    var elem_ty: Type = undefined;
     var ptr_sentinel: ?Value = null;
     switch (ptr_ptr_child_ty.zigTypeTag()) {
         .Array => {
             ptr_sentinel = ptr_ptr_child_ty.sentinel();
+            elem_ty = ptr_ptr_child_ty.childType();
         },
         .Pointer => switch (ptr_ptr_child_ty.ptrSize()) {
             .One => {
diff --git a/test/cases/compile_errors/slice_of_non_array_type.zig b/test/cases/compile_errors/slice_of_non_array_type.zig
new file mode 100644
index 0000000000..734b026038
--- /dev/null
+++ b/test/cases/compile_errors/slice_of_non_array_type.zig
@@ -0,0 +1,9 @@
+comptime {
+    _ = 1[0..];
+}
+
+// error
+// backend=stage2
+// target=native
+//
+// :2:10: error: slice of non-array type 'comptime_int'