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Reserve guarded string literals (RFC 3593)

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This commit is contained in:
Peter Jaszkowiak 2024-04-14 17:37:45 -06:00
parent 6f4ae0f345
commit 321a5db7d4
23 changed files with 1514 additions and 9 deletions
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41
compiler/rustc_lint_defs/src/builtin.rs
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@ -92,6 +92,7 @@ declare_lint_pass! {
RUST_2021_INCOMPATIBLE_OR_PATTERNS,
RUST_2021_PREFIXES_INCOMPATIBLE_SYNTAX,
RUST_2021_PRELUDE_COLLISIONS,
RUST_2024_GUARDED_STRING_INCOMPATIBLE_SYNTAX,
RUST_2024_INCOMPATIBLE_PAT,
RUST_2024_PRELUDE_COLLISIONS,
SELF_CONSTRUCTOR_FROM_OUTER_ITEM,
@ -4996,3 +4997,43 @@ declare_lint! {
Warn,
"detects pointer to integer transmutes in const functions and associated constants",
}
declare_lint! {
/// The `rust_2024_guarded_string_incompatible_syntax` lint detects `#` tokens
/// that will be parsed as part of a guarded string literal in Rust 2024.
///
/// ### Example
///
/// ```rust,edition2021,compile_fail
/// #![deny(rust_2024_guarded_string_incompatible_syntax)]
///
/// macro_rules! m {
/// (# $x:expr #) => ();
/// (# $x:expr) => ();
/// }
///
/// m!(#"hey"#);
/// m!(#"hello");
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// Prior to Rust 2024, `#"hey"#` is three tokens: the first `#`
/// followed by the string literal `"hey"` then the final `#`.
/// In Rust 2024, the whole sequence is considered a single token.
///
/// This lint suggests to add whitespace between the leading `#`
/// and the string to keep them separated in Rust 2024.
// Allow this lint -- rustdoc doesn't yet support threading edition into this lint's parser.
#[allow(rustdoc::invalid_rust_codeblocks)]
pub RUST_2024_GUARDED_STRING_INCOMPATIBLE_SYNTAX,
Allow,
"will be parsed as a guarded string in Rust 2024",
@future_incompatible = FutureIncompatibleInfo {
reason: FutureIncompatibilityReason::EditionError(Edition::Edition2024),
reference: "issue #123735 <https://github.com/rust-lang/rust/issues/123735>",
};
crate_level_only
}