> struct Tag { ... } Tag;

What's the thing with the syntax? If you don't intend to use the type elsewhere don't give it a tag, if you want, you have to give it a name. (Assuming you are annoyed by the duplicate Tag)

Which would you prefer:

    struct Tag { ... }

    typedef struct Tag { ... } Tag;

    int foo();
    int bar() { return foo(); }
    int foo() { return 3; }

    int bar() { return foo(); }
    int foo() { return 3; }