[Rust] Highlighting with multiple union on a line

[dementive]

What happened?

The rust syntax has some bugs when using multiple union() functions in one line. This entirely breaks highlighting for the rest of the file. As a temporary fix I've added this line to the end of the "union-body" section in the Rust syntax so my files don't look so bad, there is definitely a better way but this works for me for now.

- match: '\)'
    pop: true

Here is the rust code causing the issue, the lines after the union() functions do not get highlighted correctly in sublime.

    (Scopes::Character.union(Scopes::Unit).union(Scopes::Legion), "add_legion_history", Unchecked), // -tdb-
    (Scopes::Character.union(Scopes::Unit), "add_to_legion", Scope(Scopes::Legion)),
    (Scopes::Character, "disband_legion", Boolean),
    (Scopes::Character, "add_charisma", Integer),
    (Scopes::Character, "add_finesse", Integer),
    (Scopes::Character, "add_martial", Integer),