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1 files changed, 19 insertions, 0 deletions

diff --git a/src/test/compile-fail/impure-pred.rs b/src/test/compile-fail/impure-pred.rs
new file mode 100644
index 00000000..811d595a
--- /dev/null
+++ b/src/test/compile-fail/impure-pred.rs
@@ -0,0 +1,19 @@
+// -*- rust -*-
+
+// error-pattern: impure function used in constraint
+
+fn f(int a, int b) : lt(a,b) {
+}
+
+io fn lt(int a, int b) -> bool {
+  let port[int] p = port();
+  let chan[int] c = chan(p);
+  c <| 10;
+}
+
+fn main() {
+  let int a = 10;
+  let int b = 23;
+  check lt(a,b);
+  f(a,b);
+}