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Keyword tweaks #138385

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Merged
merged 5 commits into from
Mar 25, 2025
Merged

Keyword tweaks #138385

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9dd5340
Remove `is_any_keyword` methods.
nnethercote Mar 12, 2025
a28d509
Improve keyword comments a little.
nnethercote Mar 12, 2025
3aaa12f
Fix some formatting.
nnethercote Mar 12, 2025
10236fb
Alphabetize the keywords list.
nnethercote Mar 12, 2025
a29e875
Move `is_used_keyword_conditional`.
nnethercote Mar 12, 2025
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5 changes: 0 additions & 5 deletions compiler/rustc_ast/src/token.rs
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Expand Up @@ -928,11 +928,6 @@ impl Token {
self.is_non_raw_ident_where(Ident::is_path_segment_keyword)
}

/// Don't use this unless you're doing something very loose and heuristic-y.
pub fn is_any_keyword(&self) -> bool {
self.is_non_raw_ident_where(Ident::is_any_keyword)
}

/// Returns true for reserved identifiers used internally for elided lifetimes,
/// unnamed method parameters, crate root module, error recovery etc.
pub fn is_special_ident(&self) -> bool {
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33 changes: 11 additions & 22 deletions compiler/rustc_span/src/symbol.rs
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Expand Up @@ -26,13 +26,14 @@ symbols! {
// documents (such as the Rust Reference) about whether it is a keyword
// (e.g. `_`).
//
// If you modify this list, adjust any relevant `Symbol::{is,can_be}_*` predicates and
// `used_keywords`.
// But this should rarely be necessary if the keywords are kept in alphabetic order.
// If you modify this list, adjust any relevant `Symbol::{is,can_be}_*`
// predicates and `used_keywords`. (This should rarely be necessary if
// the keywords are kept in alphabetic order.) Also consider adding new
// keywords to the `ui/parser/raw/raw-idents.rs` test.
Keywords {
// Special reserved identifiers used internally for elided lifetimes,
// unnamed method parameters, crate root module, error recovery etc.
// Matching predicates: `is_any_keyword`, `is_special`/`is_reserved`
// Matching predicates: `is_special`/`is_reserved`
//
// Notes about `kw::Empty`:
// - Its use can blur the lines between "empty symbol" and "no symbol".
Expand All @@ -48,7 +49,7 @@ symbols! {
Underscore: "_",

// Keywords that are used in stable Rust.
// Matching predicates: `is_any_keyword`, `is_used_keyword_always`/`is_reserved`
// Matching predicates: `is_used_keyword_always`/`is_reserved`
As: "as",
Break: "break",
Const: "const",
Expand Down Expand Up @@ -86,7 +87,7 @@ symbols! {
While: "while",

// Keywords that are used in unstable Rust or reserved for future use.
// Matching predicates: `is_any_keyword`, `is_unused_keyword_always`/`is_reserved`
// Matching predicates: `is_unused_keyword_always`/`is_reserved`
Abstract: "abstract",
Become: "become",
Box: "box",
Expand All @@ -101,27 +102,25 @@ symbols! {
Yield: "yield",

// Edition-specific keywords that are used in stable Rust.
// Matching predicates: `is_any_keyword`, `is_used_keyword_conditional`/`is_reserved` (if
// Matching predicates: `is_used_keyword_conditional`/`is_reserved` (if
// the edition suffices)
Async: "async", // >= 2018 Edition only
Await: "await", // >= 2018 Edition only
Dyn: "dyn", // >= 2018 Edition only

// Edition-specific keywords that are used in unstable Rust or reserved for future use.
// Matching predicates: `is_any_keyword`, `is_unused_keyword_conditional`/`is_reserved` (if
// Matching predicates: `is_unused_keyword_conditional`/`is_reserved` (if
// the edition suffices)
Gen: "gen", // >= 2024 Edition only
Try: "try", // >= 2018 Edition only

// NOTE: When adding new keywords, consider adding them to the ui/parser/raw/raw-idents.rs test.

// "Lifetime keywords": regular keywords with a leading `'`.
// Matching predicates: `is_any_keyword`
// Matching predicates: none
UnderscoreLifetime: "'_",
StaticLifetime: "'static",

// Weak keywords, have special meaning only in specific contexts.
// Matching predicates: `is_any_keyword`
// Matching predicates: none
Auto: "auto",
Builtin: "builtin",
Catch: "catch",
Expand Down Expand Up @@ -2677,11 +2676,6 @@ pub mod sym {
}

impl Symbol {
/// Don't use this unless you're doing something very loose and heuristic-y.
pub fn is_any_keyword(self) -> bool {
self >= kw::As && self <= kw::Yeet
}

fn is_special(self) -> bool {
self <= kw::Underscore
}
Expand Down Expand Up @@ -2738,11 +2732,6 @@ impl Symbol {
}

impl Ident {
/// Don't use this unless you're doing something very loose and heuristic-y.
pub fn is_any_keyword(self) -> bool {
self.name.is_any_keyword()
}

/// Returns `true` for reserved identifiers used internally for elided lifetimes,
/// unnamed method parameters, crate root module, error recovery etc.
pub fn is_special(self) -> bool {
Expand Down
2 changes: 1 addition & 1 deletion src/tools/rustfmt/src/parse/macros/mod.rs
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Expand Up @@ -81,7 +81,7 @@ pub(crate) struct ParsedMacroArgs {
}

fn check_keyword<'a, 'b: 'a>(parser: &'a mut Parser<'b>) -> Option<MacroArg> {
if parser.token.is_any_keyword()
if parser.token.is_reserved_ident()
&& parser.look_ahead(1, |t| *t == TokenKind::Eof || *t == TokenKind::Comma)
{
let keyword = parser.token.ident().unwrap().0.name;
Expand Down