From d907f574e02aadf8196e616bcc2fb2813cf2c82c Mon Sep 17 00:00:00 2001
From: xackus <14938807+xackus@users.noreply.github.com>
Date: Sat, 20 Jun 2020 18:35:01 +0200
Subject: [PATCH] stage1: fix concat of sliced str literals

---
 src/ir.cpp                     | 3 +--
 test/stage1/behavior/slice.zig | 5 +++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ir.cpp b/src/ir.cpp
index bb6ca554d..3fa138ed8 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -826,12 +826,11 @@ static ZigValue *const_ptr_pointee_unchecked_no_isf(CodeGen *g, ZigValue *const_
             ZigValue *array_val = const_val->data.x_ptr.data.base_array.array_val;
             size_t elem_index = const_val->data.x_ptr.data.base_array.elem_index;
 
-            // TODO handle sentinel terminated arrays
             expand_undef_array(g, array_val);
             result = g->pass1_arena->create<ZigValue>();
             result->special = array_val->special;
             result->type = get_array_type(g, array_val->type->data.array.child_type,
-                    array_val->type->data.array.len - elem_index, nullptr);
+                    array_val->type->data.array.len - elem_index, array_val->type->data.array.sentinel);
             result->data.x_array.special = ConstArraySpecialNone;
             result->data.x_array.data.s_none.elements = &array_val->data.x_array.data.s_none.elements[elem_index];
             result->parent.id = ConstParentIdArray;
diff --git a/test/stage1/behavior/slice.zig b/test/stage1/behavior/slice.zig
index 1faefe680..8aa3bdb7c 100644
--- a/test/stage1/behavior/slice.zig
+++ b/test/stage1/behavior/slice.zig
@@ -280,6 +280,11 @@ test "slice syntax resulting in pointer-to-array" {
             expect(slice[0] == 5);
             comptime expect(@TypeOf(src_slice[0..2]) == *align(4) [2]u8);
         }
+
+        fn testConcatStrLiterals() void {
+            expectEqualSlices("a"[0..] ++ "b"[0..], "ab");
+            expectEqualSlices("a"[0..:0] ++ "b"[0..:0], "ab");
+        }
     };
 
     S.doTheTest();