1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
//@ proc-macro: parent-source-spans.rs
#![feature(decl_macro)]
extern crate parent_source_spans;
use parent_source_spans::parent_source_spans;
macro one($a:expr, $b:expr) {
two!($a, $b);
//~^ ERROR first parent: "hello"
//~| ERROR second parent: "world"
}
macro two($a:expr, $b:expr) {
three!($a, $b);
//~^ ERROR first final: "hello"
//~| ERROR second final: "world"
//~| ERROR first final: "yay"
//~| ERROR second final: "rust"
}
// forwarding tokens directly doesn't create a new source chain
macro three($($tokens:tt)*) {
four!($($tokens)*);
}
macro four($($tokens:tt)*) {
parent_source_spans!($($tokens)*);
//~^ ERROR cannot find value `ok` in this scope
//~| ERROR cannot find value `ok` in this scope
//~| ERROR cannot find value `ok` in this scope
}
fn main() {
one!("hello", "world");
//~^ ERROR first grandparent: "hello"
//~| ERROR second grandparent: "world"
//~| ERROR first source: "hello"
//~| ERROR second source: "world"
two!("yay", "rust");
//~^ ERROR first parent: "yay"
//~| ERROR second parent: "rust"
//~| ERROR first source: "yay"
//~| ERROR second source: "rust"
three!("hip", "hop");
//~^ ERROR first final: "hip"
//~| ERROR second final: "hop"
//~| ERROR first source: "hip"
//~| ERROR second source: "hop"
}
|
