diff --git a/tests_errors/vec-different-size-assign.ispc b/tests_errors/vec-different-size-assign.ispc
new file mode 100644
index 00000000..5409bab6
--- /dev/null
+++ b/tests_errors/vec-different-size-assign.ispc
@@ -0,0 +1,5 @@
+// Can't convert between differently sized vector types
+
+void foo(float<3> a, int<2> b) {
+    a += b;
+}
diff --git a/tests_errors/vec-size-compile-constant.ispc b/tests_errors/vec-size-compile-constant.ispc
new file mode 100644
index 00000000..45b9b162
--- /dev/null
+++ b/tests_errors/vec-size-compile-constant.ispc
@@ -0,0 +1,5 @@
+// Syntax error--token "i" unexpected
+
+void foo(uniform int i) {
+    float<i> a;
+}