mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
92 lines
3.4 KiB
Rust
92 lines
3.4 KiB
Rust
// Test that certain unevaluated constant expression arguments that are
|
|
// deemed too verbose or complex and that may leak private or
|
|
// `doc(hidden)` struct fields are not displayed in the documentation.
|
|
//
|
|
// Read the documentation of `rustdoc::clean::utils::print_const_expr`
|
|
// for further details.
|
|
#![feature(const_trait_impl, generic_const_exprs, adt_const_params, generic_const_items)]
|
|
#![allow(incomplete_features)]
|
|
|
|
use std::marker::ConstParamTy;
|
|
|
|
// @has hide_complex_unevaluated_const_arguments/trait.Stage.html
|
|
pub trait Stage {
|
|
// A helper constant that prevents const expressions containing it
|
|
// from getting fully evaluated since it doesn't have a body and
|
|
// thus is non-reducible. This allows us to specifically test the
|
|
// pretty-printing of *unevaluated* consts.
|
|
const ABSTRACT: usize;
|
|
|
|
// Currently considered "overly complex" by the `generic_const_exprs`
|
|
// feature. If / once this expression kind gets supported, this
|
|
// unevaluated const expression could leak the private struct field.
|
|
//
|
|
// FIXME: Once the line below compiles, make this a test that
|
|
// ensures that the private field is not printed.
|
|
//
|
|
//const ARRAY0: [u8; Struct { private: () } + Self::ABSTRACT];
|
|
|
|
// This assoc. const could leak the private assoc. function `Struct::new`.
|
|
// Ensure that this does not happen.
|
|
//
|
|
// @has - '//*[@id="associatedconstant.ARRAY1"]' \
|
|
// 'const ARRAY1: [u8; { _ }]'
|
|
const ARRAY1: [u8; Struct::new(/* ... */).do_something(Self::ABSTRACT * 1_000)]
|
|
where [(); Struct::new(/* ... */).do_something(Self::ABSTRACT * 1_000)]:;
|
|
|
|
// @has - '//*[@id="associatedconstant.VERBOSE"]' \
|
|
// 'const VERBOSE: [u16; { _ }]'
|
|
const VERBOSE: [u16; compute("thing", 9 + 9) * Self::ABSTRACT]
|
|
where [(); compute("thing", 9 + 9) * Self::ABSTRACT]:;
|
|
|
|
// Check that we do not leak the private struct field contained within
|
|
// the path. The output could definitely be improved upon
|
|
// (e.g. printing sth. akin to `<Self as Helper<{ _ }>>::OUT`) but
|
|
// right now “safe is safe”.
|
|
//
|
|
// @has - '//*[@id="associatedconstant.PATH"]' \
|
|
// 'const PATH: usize = _'
|
|
const PATH: usize = <Self as Helper<{ Struct { private: () } }>>::OUT;
|
|
}
|
|
|
|
const fn compute(input: &str, extra: usize) -> usize {
|
|
input.len() + extra
|
|
}
|
|
|
|
pub trait Helper<const S: Struct> {
|
|
const OUT: usize;
|
|
}
|
|
|
|
impl<const S: Struct, St: Stage + ?Sized> Helper<S> for St {
|
|
const OUT: usize = St::ABSTRACT;
|
|
}
|
|
|
|
// Currently in rustdoc, const arguments are not evaluated in this position
|
|
// and therefore they fall under the realm of `print_const_expr`.
|
|
// If rustdoc gets patched to evaluate const arguments, it is fine to replace
|
|
// this test as long as one can ensure that private fields are not leaked!
|
|
//
|
|
// @has hide_complex_unevaluated_const_arguments/trait.Sub.html \
|
|
// '//pre[@class="rust item-decl"]' \
|
|
// 'pub trait Sub: Sup<{ _ }, { _ }> { }'
|
|
pub trait Sub: Sup<{ 90 * 20 * 4 }, { Struct { private: () } }> {}
|
|
|
|
pub trait Sup<const N: usize, const S: Struct> {}
|
|
|
|
#[derive(ConstParamTy, PartialEq, Eq)]
|
|
pub struct Struct { private: () }
|
|
|
|
impl Struct {
|
|
const fn new() -> Self { Self { private: () } }
|
|
const fn do_something(self, x: usize) -> usize {
|
|
x
|
|
}
|
|
}
|
|
/* FIXME(const-trait): readd this
|
|
impl const std::ops::Add<usize> for Struct {
|
|
type Output = usize;
|
|
|
|
fn add(self, _: usize) -> usize { 0 }
|
|
}
|
|
*/
|