mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-25 16:24:46 +00:00
66 lines
790 B
Rust
66 lines
790 B
Rust
//@ revisions: rpass1 rpass2
|
|
|
|
pub fn foo() {
|
|
bar();
|
|
baz::<()>();
|
|
}
|
|
|
|
fn bar()
|
|
where
|
|
<() as Table>::AllColumns:,
|
|
{
|
|
}
|
|
|
|
fn baz<W>()
|
|
where
|
|
W: AsQuery,
|
|
<W as AsQuery>::Query:,
|
|
{
|
|
}
|
|
|
|
trait AsQuery {
|
|
type Query;
|
|
}
|
|
|
|
trait UnimplementedTrait {}
|
|
|
|
impl<T> AsQuery for T
|
|
where
|
|
T: UnimplementedTrait,
|
|
{
|
|
type Query = ();
|
|
}
|
|
|
|
struct Wrapper<Expr>(Expr);
|
|
|
|
impl<Ret> AsQuery for Wrapper<Ret> {
|
|
type Query = ();
|
|
}
|
|
|
|
impl AsQuery for ()
|
|
where
|
|
Wrapper<<() as Table>::AllColumns>: AsQuery,
|
|
{
|
|
type Query = ();
|
|
}
|
|
|
|
trait Table {
|
|
type AllColumns;
|
|
}
|
|
|
|
#[cfg(rpass1)]
|
|
impl Table for () {
|
|
type AllColumns = Checksum1;
|
|
}
|
|
#[cfg(rpass1)]
|
|
struct Checksum1;
|
|
|
|
#[cfg(rpass2)]
|
|
impl Table for () {
|
|
type AllColumns = Checksum2;
|
|
}
|
|
#[cfg(rpass2)]
|
|
struct Checksum2;
|
|
|
|
fn main() {}
|