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Add a ui test for RUSTC_BOOTSTRAP vs rustc's stability

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Jieyou Xu 2024-11-13 17:56:21 +08:00
parent 202caa7c57
commit c130501d65
2 changed files with 57 additions and 0 deletions
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10
tests/ui/bootstrap/rustc_bootstap.force_stable.stderr Normal file
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error: the option `Z` is only accepted on the nightly compiler
help: consider switching to a nightly toolchain: `rustup default nightly`
note: selecting a toolchain with `+toolchain` arguments require a rustup proxy; see <https://rust-lang.github.io/rustup/concepts/index.html>
note: for more information about Rust's stability policy, see <https://doc.rust-lang.org/book/appendix-07-nightly-rust.html#unstable-features>
error: 1 nightly option were parsed

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tests/ui/bootstrap/rustc_bootstap.rs Normal file
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//! Check `RUSTC_BOOTSTRAP`'s behavior in relation to feature stability and what rustc considers
//! itself to be (stable vs non-stable ).
//!
//! `RUSTC_BOOTSTRAP` accepts:
//!
//! - `1`: cheat, allow usage of unstable features even if rustc thinks it is a stable compiler.
//! - `x,y,z`: comma-delimited list of crates.
//! - `-1`: force rustc to think it is a stable compiler.
// ignore-tidy-linelength
//@ revisions: default_nightly cheat cheat_single_crate cheat_multi_crate force_stable invalid_zero invalid_junk
//@ only-nightly
//@[default_nightly] unset-rustc-env:RUSTC_BOOTSTRAP
//@[default_nightly] check-pass
// For a nightly compiler, this is same as `default_nightly` as if `RUSTC_BOOTSTRAP` was unset.
//@[invalid_zero] rustc-env:RUSTC_BOOTSTRAP=0
//@[invalid_zero] check-pass
// Invalid values are silently discarded, same as `default_nightly`, i.e. as if `RUSTC_BOOTSTRAP`
// was unset.
//@[invalid_junk] rustc-env:RUSTC_BOOTSTRAP=*
//@[invalid_junk] check-pass
//@[cheat] rustc-env:RUSTC_BOOTSTRAP=1
//@[cheat] check-pass
//@[cheat_single_crate] rustc-env:RUSTC_BOOTSTRAP=x
//@[cheat_single_crate] check-pass
//@[cheat_multi_crate] rustc-env:RUSTC_BOOTSTRAP=x,y,z
//@[cheat_multi_crate] check-pass
// Note: compiletest passes some `-Z` flags to the compiler for ui testing purposes, so here we
// instead abuse the fact that `-Z unstable-options` is also part of rustc's stability story and is
// also affected by `RUSTC_BOOTSTRAP`.
//@[force_stable] rustc-env:RUSTC_BOOTSTRAP=-1
//@[force_stable] compile-flags: -Z unstable-options
//@[force_stable] regex-error-pattern: error: the option `Z` is only accepted on the nightly compiler
#![crate_type = "lib"]
// Note: `rustc_attrs` is a perma-unstable internal feature that is unlikely to change, which is
// used as a proxy to check `RUSTC_BOOTSTRAP` versus stability checking logic.
#![feature(rustc_attrs)]