diff --git a/test/behavior/vector.zig b/test/behavior/vector.zig
index 4ae7e76c74735ddaa23a24b115fab7a16bf37f48..db42658c432e5d5197b1e4918ac6e5e4e18f6c86 100644
--- a/test/behavior/vector.zig
+++ b/test/behavior/vector.zig
@@ -1525,3 +1525,8 @@ test "bitcast to vector with different child type" {
     try S.doTheTest();
     try comptime S.doTheTest();
 }
+
+test "index into comptime-known vector is comptime-known" {
+    const vec: @Vector(2, f16) = [2]f16{ 1.5, 3.5 };
+    if (vec[0] != 1.5) @compileError("vec should be comptime");
+}