stage2: able to slice to sentinel index at comptime

The runtime behavior allowed this in both stage1 and stage2, but stage1
fails with index out of bounds during comptime. This behavior makes
sense to support, and comptime behavior should match runtime behavior. I
implement this fix only in stage2.

1 files changed, 10 insertions, 4 deletions

diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index c479dd9c88..5008bdd7b8 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -26,11 +26,16 @@ pub fn addCases(ctx: *TestContext) !void {
             \\comptime {
             \\    var array = [_:0]u8{ 1, 2, 3, 4 };
             \\    var src_slice: [:0]u8 = &array;
-            \\    var slice = src_slice[2..5];
+            \\    var slice = src_slice[2..6];
             \\    _ = slice;
             \\}
             \\comptime {
             \\    var array = [_:0]u8{ 1, 2, 3, 4 };
+            \\    var slice = array[2..6];
+            \\    _ = slice;
+            \\}
+            \\comptime {
+            \\    var array = [_]u8{ 1, 2, 3, 4 };
             \\    var slice = array[2..5];
             \\    _ = slice;
             \\}
@@ -40,9 +45,10 @@ pub fn addCases(ctx: *TestContext) !void {
             \\    _ = slice;
             \\}
         , &[_][]const u8{
-            ":4:26: error: end index 5 out of bounds for slice of length 4",
-            ":9:22: error: end index 5 out of bounds for array of length 4",
-            ":14:22: error: start index 3 is larger than end index 2",
+            ":4:26: error: end index 6 out of bounds for slice of length 4 +1 (sentinel)",
+            ":9:22: error: end index 6 out of bounds for array of length 4 +1 (sentinel)",
+            ":14:22: error: end index 5 out of bounds for array of length 4",
+            ":19:22: error: start index 3 is larger than end index 2",
         });
     }