tests/ui/where-clauses/where-clause-on-unit-struct.rs

//! Regression test for <https://github.com/rust-lang/rust/issues/17904>.
// Test that we can parse a unit struct with a where clause, even if
// it leads to an error later on since `T` is unused.

struct Foo<T> where T: Copy; //~ ERROR parameter `T` is never used

fn main() {}