Destruct:表示可以析构(执行清理操作)的类型。 Tuple:用于表示元组类型。 Unsize<T>:用于实现逆变量大小的转换,即从较特定的类型到较通用的类型。 CoerceUnsized<T>:用于实现类型的切换,帮助编译器进行类型转换。 DispatchFromDyn<T>:用于实现从动态分派的trait对象中获取具体类型。
DiagnosticStyledString(pub ...):这是一个自定义的字符串类型,用于在错误报告中指定不同部分的显示样式,例如颜色、字体等。 IntoDiagnosticArg、AddToDiagnostic和DecorateLint<'a>这三个特性用于为错误报告的不同部分提供转换、添加和装饰的功能。 IntoDiagnosticArg:这是一个将值转换为DiagnosticArg的特性,用于将错误...
借用又分成两种 【1】不可变借用(immutable borrow):Rust允许一个变量同时有多个不可变借用,例如let x=String::from("test"); let y = &x; let z=&x;,则y和z都是x的不可变借用 【2】可变借用(mutable borrow):Rust只允许一个变量同时有一个可变借用,例如let x=vec![0;32]; let y=& mut x; let...
pub(crate) type RewriteResult = Result<String, RewriteError>; pub(crate) trait Rewrite { /// Rewrite self into shape. fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String>; fn rewrite_result( &self, context: &RewriteContext<'_>,...
/// let s = String::from("Oh, no!"); /// let mut y: Rc<&str> = x.clone().into(); /// let mut y: Rc<&str> = x.clone(); /// unsafe { /// // this is Undefined Behavior, because x's inner type /// // is &'long str, not &'short str2...
let mut potential_assoc_types = Vec::new(); let dummy_self = self.tcx().types.trait_object_dummy_self; for trait_bound in hir_trait_bounds.iter().rev() { // FIXME: This doesn't handle `? const`. if trait_bound.modifiers == hir::TraitBoundModifier::Maybe { if let hir::Bound...
into(), }; // Eat comma separator @@ -311,10 +314,11 @@ fn parse_comma_sep<S>(subtree: &tt::Subtree<S>) -> Vec<SmolStr> { .token_trees .iter() .filter_map(|tt| match tt { tt::TokenTree::Leaf(tt::Leaf::Literal(lit)) => { // FIXME: escape? raw string? Some(Smol...
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struct Person { given_name: String, // no default family_name: String, // no default other_names: Vec<String>, // default = Vec::new() email: Option<String>, // default = None //... } There could be some function that returns an &uninit Person where the compiler checks that yo...
let seed_vec = hc64.to_le_bytes().into_iter().chain(0u8..8).collect::<crate::vec::Vec<u8>>(); let seed: [u8; 16] = seed_vec.as_slice().try_into().unwrap(); rand::SeedableRng::from_seed(seed) } } 16 changes: 8 additions & 8 deletions 16 rust/alloc/raw_vec.rs ...