32 lines
741 B
Rust
32 lines
741 B
Rust
|
#![feature(decl_macro, rustc_attrs)]
|
||
|
|
|
||
|
|
#[rustc_macro_transparency = "transparent"]
|
||
|
|
macro transparent() {
|
||
|
|
struct Transparent;
|
||
|
|
let transparent = 0;
|
||
|
|
}
|
||
|
|
#[rustc_macro_transparency = "semitransparent"]
|
||
|
|
macro semitransparent() {
|
||
|
|
struct SemiTransparent;
|
||
|
|
let semitransparent = 0;
|
||
|
|
}
|
||
|
|
#[rustc_macro_transparency = "opaque"]
|
||
|
|
macro opaque() {
|
||
|
|
struct Opaque;
|
||
|
|
let opaque = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
transparent!();
|
||
|
|
semitransparent!();
|
||
|
|
opaque!();
|
||
|
|
|
||
|
|
Transparent; // OK
|
||
|
|
SemiTransparent; // OK
|
||
|
|
Opaque; //~ ERROR cannot find value `Opaque` in this scope
|
||
|
|
|
||
|
|
transparent; // OK
|
||
|
|
semitransparent; //~ ERROR cannot find value `semitransparent` in this scope
|
||
|
|
opaque; //~ ERROR cannot find value `opaque` in this scope
|
||
|
|
}
|