adcda6ca9a
Use a visitor to collect *all* items (including those nested) that were stripped behind a `cfg` condition.
```
error[E0425]: cannot find function `f` in this scope
--> $DIR/nested-cfg-attrs.rs:4:13
|
LL | fn main() { f() }
| ^ not found in this scope
|
note: found an item that was configured out
--> $DIR/nested-cfg-attrs.rs:2:4
|
LL | fn f() {}
| ^
note: the item is gated here
--> $DIR/nested-cfg-attrs.rs:1:35
|
LL | #[cfg_attr(all(), cfg_attr(all(), cfg(FALSE)))]
| ^^^^^^^^^^
```
20 lines
838 B
Rust
20 lines
838 B
Rust
//! Test that nested `cfg_attr` attributes work correctly for conditional compilation.
|
|
//! This checks that `cfg_attr` can be arbitrarily deeply nested and that the
|
|
//! expansion works from outside to inside, eventually applying the innermost
|
|
//! conditional compilation directive.
|
|
//!
|
|
//! In this test, `cfg_attr(all(), cfg_attr(all(), cfg(false)))` should expand to:
|
|
//! 1. `cfg_attr(all(), cfg(false))` (outer cfg_attr applied)
|
|
//! 2. `cfg(false)` (inner cfg_attr applied)
|
|
//! 3. Function `f` is excluded from compilation
|
|
//!
|
|
//! Added in <https://github.com/rust-lang/rust/pull/34216>.
|
|
|
|
#[cfg_attr(all(), cfg_attr(all(), cfg(false)))] //~ NOTE the item is gated here
|
|
fn f() {} //~ NOTE found an item that was configured out
|
|
|
|
fn main() {
|
|
f() //~ ERROR cannot find function `f` in this scope
|
|
//~^ NOTE not found in this scope
|
|
}
|