src/test/ui/issues/issue-20616.rs

// run-pass
#![allow(dead_code)]
type MyType<'a, T> = &'a T;

// combine lifetime bounds and type arguments in usual way
type TypeA<'a> = MyType<'a, ()>;

// ensure token `>>` works fine
type TypeB = Box<TypeA<'static>>;
type TypeB_ = Box<TypeA<'static,>>;

// trailing comma when combine lifetime bounds and type arguments
type TypeC<'a> = MyType<'a, (),>;

// normal lifetime bounds
type TypeD = TypeA<'static>;

// trailing comma on lifetime bounds
type TypeE = TypeA<'static,>;

// normal type argument
type TypeF<T> = Box<T>;

// type argument with trailing comma
type TypeG<T> = Box<T,>;

// trailing comma on lifetime defs
type TypeH<'a,> = &'a ();

// trailing comma on type argument
type TypeI<T,> = T;

static STATIC: () = ();

fn main() {

    // ensure token `>=` works fine
    let _: TypeA<'static>= &STATIC;
    let _: TypeA<'static,>= &STATIC;

    // ensure token `>>=` works fine
    let _: Box<TypeA<'static>>= Box::new(&STATIC);
    let _: Box<TypeA<'static,>>= Box::new(&STATIC);
}