Merge remote-tracking branch 'origin/topic/jsiwek/index-opt-record'

* origin/topic/jsiwek/index-opt-record:
  Fix indexing for record types with optional fields

Closes #378.

testing/btest/Baseline/language.set-opt-record-index/output

@@ -0,0 +1,16 @@
+{
+[a=1, b=<uninitialized>],
+[a=4, b=5],
+[a=3, b=<uninitialized>]
+}
+
+[a=1, b=<uninitialized>]
+[a=4, b=5]
+[a=3, b=<uninitialized>]
+
+T
+F
+
+T
+F
+T

testing/btest/language/set-opt-record-index.bro

@@ -0,0 +1,55 @@
+# @TEST-EXEC: bro %INPUT  >output 2>&1
+# @TEST-EXEC: btest-diff output
+
+# Make sure a set can be indexed with a record that has optional fields
+
+type FOO: record {
+        a: count;
+        b: count &optional;
+};
+
+event bro_init()
+        {
+        local set_of_foo: set[FOO] = set();
+
+        local f: FOO;
+        f$a = 1;
+
+        add set_of_foo[f];
+        add set_of_foo[[$a=3]];
+
+        local f3: FOO; # = [$a=4, $b=5];
+        f3$a = 4;
+        f3$b = 5;
+
+        add set_of_foo[f3];
+
+        add set_of_foo[[$a=4, $b=5]];
+
+        print set_of_foo;
+
+        print "";
+
+        for ( i in set_of_foo )
+            print i;
+
+        print "";
+
+        local f2: FOO;
+        f2$a = 2;
+
+        print f in set_of_foo;
+        print f2 in set_of_foo;
+
+        print "";
+
+        f3$a = 4;
+        print f3 in set_of_foo;
+
+        f3$b = 4;
+        print f3 in set_of_foo;
+
+        f3$b = 5;
+        print f3 in set_of_foo;
+
+        }