diff --git a/test/run_tests.cpp b/test/run_tests.cpp
index 564381cd1a..dde3b68f21 100644
--- a/test/run_tests.cpp
+++ b/test/run_tests.cpp
@@ -1467,6 +1467,18 @@ fn function_with_return_type_type() {
             ".tmp_source.zig:4:5: note: unable to evaluate this expression at compile time",
             ".tmp_source.zig:3:32: note: required to be compile-time function because of return type 'type'");
 
+    add_compile_fail_case("non pure function required to be pure", R"SOURCE(
+var a: i32 = 0;
+
+fn foo() {
+    @setFnStaticEval(this, true);
+    a = 1;
+}
+    )SOURCE", 3,
+            ".tmp_source.zig:4:1: error: failed to evaluate function at compile time",
+            ".tmp_source.zig:6:5: note: unable to evaluate this expression at compile time",
+            ".tmp_source.zig:5:5: note: required to be compile-time function here");
+
     add_compile_fail_case("bogus method call on slice", R"SOURCE(
 fn f(m: []const u8) {
     m.copy(u8, self.list.items[old_len...], m);