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Document some of the AST nodes #106383

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Merged
merged 2 commits into from
Jan 3, 2023
Merged

Document some of the AST nodes #106383

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3c7c694
Document rustc_ast::Extern variants
Manishearth Jan 2, 2023
157211f
Document rustc_ast::FnHeader fields
Manishearth Jan 2, 2023
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15 changes: 15 additions & 0 deletions compiler/rustc_ast/src/ast.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2705,8 +2705,19 @@ impl Item {
/// `extern` qualifier on a function item or function type.
#[derive(Clone, Copy, Encodable, Decodable, Debug)]
pub enum Extern {
/// No explicit extern keyword was used
///
/// E.g. `fn foo() {}`
None,
/// An explicit extern keyword was used, but with implicit ABI
///
/// E.g. `extern fn foo() {}`
///
/// This is just `extern "C"` (see `rustc_target::spec::abi::Abi::FALLBACK`)
Implicit(Span),
/// An explicit extern keyword was used with an explicit ABI
///
/// E.g. `extern "C" fn foo() {}`
Explicit(StrLit, Span),
}

Expand All @@ -2725,9 +2736,13 @@ impl Extern {
/// included in this struct (e.g., `async unsafe fn` or `const extern "C" fn`).
#[derive(Clone, Copy, Encodable, Decodable, Debug)]
pub struct FnHeader {
/// The `unsafe` keyword, if any
pub unsafety: Unsafe,
/// The `async` keyword, if any
pub asyncness: Async,
/// The `const` keyword, if any
pub constness: Const,
/// The `extern` keyword and corresponding ABI string, if any
pub ext: Extern,
}

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