mirror of https://github.com/rust-lang/rust
76 lines
1.5 KiB
Rust
76 lines
1.5 KiB
Rust
mod mul1 {
|
|
pub trait Mul {}
|
|
}
|
|
|
|
mod mul2 {
|
|
pub trait Mul {}
|
|
}
|
|
|
|
mod mul3 {
|
|
enum Mul {
|
|
Yes,
|
|
No
|
|
}
|
|
}
|
|
|
|
mod mul4 {
|
|
type Mul = String;
|
|
}
|
|
|
|
mod mul5 {
|
|
struct Mul{
|
|
left_term: u32,
|
|
right_term: u32
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct Foo;
|
|
|
|
// When we comment the next line:
|
|
//use mul1::Mul;
|
|
|
|
// BEFORE, we got the following error for the `impl` below:
|
|
// error: use of undeclared trait name `Mul` [E0405]
|
|
// AFTER, we get this message:
|
|
// error: trait `Mul` is not in scope.
|
|
// help: ...
|
|
// help: you can import several candidates into scope (`use ...;`):
|
|
// help: `mul1::Mul`
|
|
// help: `mul2::Mul`
|
|
// help: `std::ops::Mul`
|
|
|
|
impl Mul for Foo {
|
|
//~^ ERROR cannot find trait `Mul`
|
|
}
|
|
|
|
// BEFORE, we got:
|
|
// error: use of undeclared type name `Mul` [E0412]
|
|
// AFTER, we get:
|
|
// error: type name `Mul` is not in scope. Maybe you meant:
|
|
// help: ...
|
|
// help: you can import several candidates into scope (`use ...;`):
|
|
// help: `mul1::Mul`
|
|
// help: `mul2::Mul`
|
|
// help: `mul3::Mul`
|
|
// help: `mul4::Mul`
|
|
// help: and 2 other candidates
|
|
fn getMul() -> Mul {
|
|
//~^ ERROR cannot find type `Mul`
|
|
}
|
|
|
|
// Let's also test what happens if the trait doesn't exist:
|
|
impl ThisTraitReallyDoesntExistInAnyModuleReally for Foo {
|
|
//~^ ERROR cannot find trait `ThisTraitReallyDoesntExistInAnyModuleReally`
|
|
}
|
|
|
|
// Let's also test what happens if there's just one alternative:
|
|
impl Div for Foo {
|
|
//~^ ERROR cannot find trait `Div`
|
|
}
|
|
|
|
fn main() {
|
|
let foo = Foo();
|
|
println!("Hello, {:?}!", foo);
|
|
}
|