Don't compute pre- and postconditions for item_consts

Since item_consts can't refer to or modify local variables, they
don't participate in typestate and thus get empty pre and
postconditions by default.

Closes #1660

1 files changed, 3 insertions, 0 deletions

diff --git a/src/test/run-pass/issue-1660.rs b/src/test/run-pass/issue-1660.rs
new file mode 100644
index 00000000000..0f4958e6ae1
--- /dev/null
+++ b/src/test/run-pass/issue-1660.rs
@@ -0,0 +1,3 @@
+fn main() {
+    const _x: int = 1<<2;
+}