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47 lines
1.2 KiB
Rust
47 lines
1.2 KiB
Rust
// https://github.com/rust-lang/rust/issues/54478
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#![crate_name="foo"]
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// Issue #54478: regression test showing that we can demonstrate
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// `#[global_allocator]` in code blocks built by `rustdoc`.
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//
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// ## Background
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//
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// Changes in lang-item visibility injected failures that were only
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// exposed when compiling with `-C prefer-dynamic`. But `rustdoc` used
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// `-C prefer-dynamic` (and had done so for years, for reasons we did
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// not document at that time).
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//
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// Rather than try to revise the visbility semanics, we instead
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// decided to change `rustdoc` to behave more like the compiler's
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// default setting, by leaving off `-C prefer-dynamic`.
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//@ compile-flags:--test
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//! This is a doc comment
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//!
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//! ```rust
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//! use std::alloc::*;
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//!
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//! #[global_allocator]
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//! static ALLOC: A = A;
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//!
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//! static mut HIT: bool = false;
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//!
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//! struct A;
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//!
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//! unsafe impl GlobalAlloc for A {
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//! unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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//! HIT = true;
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//! System.alloc(layout)
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//! }
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//! unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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//! System.dealloc(ptr, layout);
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//! }
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//! }
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//!
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//! fn main() {
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//! drop(String::from("An allocation"));
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//! assert!(unsafe { HIT });
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//! }
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//! ```
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