Fix some nested patterns in rustc

In rustc, nested patterns were potentially matching when they shouldn't
match, because a loop index wasn't being incremented. Fixed it and added
one test case.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/test/run-pass/nested-pattern.rs b/src/test/run-pass/nested-pattern.rs
new file mode 100644
index 00000000..e59c2dd5
--- /dev/null
+++ b/src/test/run-pass/nested-pattern.rs
@@ -0,0 +1,29 @@
+// a bug was causing this to complain about leaked memory on exit
+
+use std;
+import std.option;
+import std.option.some;
+import std.option.none;
+
+tag t {
+  foo(int, uint);
+  bar(int, option.t[int]);
+}
+
+fn nested(t o) {
+
+  alt (o) {
+    case (bar(?i, some[int](_))) {
+      log_err "wrong pattern matched";
+      fail;
+    }
+    case (_) {
+      log_err "succeeded";
+    }
+  }
+
+}
+
+fn main() {
+  nested (bar (1, none[int]));
+}
\ No newline at end of file