Add TODO notice on a sorta-important scoping bug

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/compiler.rs

@@ -172,7 +172,7 @@ impl StmtVisitor for LocalAssignCollector {
         // we visit the block statement because even though it goes below the current "local"
         // scope, we're ultimately trying to get a list of ALL local names that are assigned to in
         // this scope.
-        // FIXME BUG this does create some weirdness, for example take this:
+        // TODO FIXME BUG this does create some weirdness, for example take this:
         // outer_function = () {
         //     some_value = 1234
         //     inner_function = () {