运算符的residual部分中使用非常量的错误附加信息。 NonConstTryBlockFromOutput: 表示在常量表达式的try块中返回非const类型的错误附加信息。 NonConstAwait: 表示在常量表达式中使用非const的await操作符的错误附加信息。 NonConstClosure: 表示在常量表达式中使用了非const闭包的错误附加信息。 ConsiderDereferencing: 表示...
Block:表示一个代码块。包含代码块的语句序列和最后一个表达式。 AdtExpr<'tcx>:表示一个聚合类型(例如结构体或枚举)的表达式。 ClosureExpr<'tcx>:表示闭包的表达式。 InlineAsmExpr<'tcx>:表示内联汇编表达式。 Stmt<'tcx>:表示一个语句。 LocalVarId(pub usize):表示一个局部变量的标识符。 Expr<'tcx>:表...
I think the syntactic similarity to a function definition would be harmful because it suggests that try is function-like, and so return inside the try block would “return” from the try block (akin to labeled break in any block). But this is not what would actually happen; return in a ...
_ => e }`./// However, we do not want to blame `c` for unreachability but rather say that `i`/// is unreachable. This desugaring kind allows us to avoid blaming `c`./// This also applies to `while` loops.CondTemporary,QuestionMark,TryBlock,/...
block: 代码块,用花括号包起来的多个语句 pat: 模式,普通模式匹配(非宏本身的模式)中的模式,例如 Some(t), (3, ‘a’, _) path: 路径,注意这里不是操作系统中的文件路径,而是用双冒号分隔的限定名(qualified name),如 std::cmp::PartialOrd
TryCaptureGeneric是一个trait,用于尝试从值中捕获错误,并根据是否捕获成功返回Option。 TryCapturePrintable是一个trait,用于尝试从值中捕获错误,并根据是否捕获成功返回Printable。 Printable是一个trait,用于将值E格式化为可打印的字符串。 这些结构体和trait的作用是提供一组工具和方法,以帮助开发者在编写和处理断言时...
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(transformed);// Syntax highlighting.let transformed = CodeBlockSyntaxHighlight::new(transformed);let transformed = InlineCodeSyntaxHighlight::new(transformed);// Parse `{ :attr }` attributes for blockquotes, to generate asides for instance.let transformed = QuoteAttrs::new(transformed);// parse...
// async-example/src/main.rsuse futures::executor::block_on;use futures::join;use std::io;mod file;fn main() -> io::Result<()>{ println!("Program started"); // Block on the final future block_on(load_files()); Ok(())}async fn load_files() { // Join the two futures toge...
Thetry_recvmethod doesn’t block, but will instead return aResult<T, E>immediately: anOkvalue holding a message if one is available and anErrvalue if there aren’t any messages this time. Usingtry_recvis useful if this thread has other work to do while waiting for messages: we could wr...