Compiling statrs v0.11.0error[E0658]:useof unstable library feature'iter_nth_back' -->/usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/ndarray-0.13.0/src/iterators/mod.rs:134:5|134| /fnnth_back(&mutself, n:usize)->Option<*mutA> {135| |letindex=self.index?;136| |letlen...
error[E0658]: use of unstable library feature 'bool_to_option' --> /Users/anjum/.cargo/registry/src/github.com-1ecc6299db9ec823/cargo-generate-0.17.3/src/user_parsed_input.rs:182:22 | 182 | .then_some(true) | ^^^ | = note: see issue #80967 <https://github.com/rust-lang/rust...
Status: added as unstable in 1.55 (core: add unstable no_fp_fmt_parse to disable float formatting coderust-lang/rust#86048). cfg(no_global_oom_handling). Tracking Issue: -. Used by: Kbuild (alloc). Status: added as unstable in 1.54 (alloc: Add unstable Cfg feature `no_global_oom_ha...
error[E0658]:useof unstable library feature'drain_filter': recently added -->src/main.rs:7:31|7|letremoved_items= items.drain_filter(|item|if*item =="c"{true}else{false}).collect::<Vec<_>>(); | ^^^ | = note: see issue #43244<https://github.com/rust-lang/rust/issues/43244...
#[unstable(feature = "fn_traits", issue = "29625")] extern "rust-call" fn call_once(self, args: Args) -> Self::Output; } 包含两个部分: 关联类型(associated types)。Output 定义了闭包返回的数据类型; 方法(methods),也称关联函数(associated functions)。call_once 第一个参数是 self,会转移...
pub struct Vec<T, #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global> { buf: RawVec<T, A>, len: usize,} pub(crate) struct RawVec<T, A: Allocator = Global> { ptr: Unique<T>, cap: usize,
Why is it not enough to pass --unstable-features flag to "sign a contract that I'm using unstable". This makes it annoying to use unstable features and provide feedback for them so much that one would rather give up on the idea and wait until the feature becomes stable. With rustc ...
}pubstructVec<T,#[unstable(feature ="allocator_api", issue ="32838")]A: Allocator = Global> { buf: RawVec<T, A>, len:usize, } 通过代码我们可以看到,String 和 Vec 实际都定义为结构体。 智能指针可以让代码的开发相对来说容易一些。经过前面的学习,我们知道 Rust 基于所有权出发,定义了一套完整...
标记为不稳定(Unstable)和特性开关(Feature Gate)的语言特性或标准库特性只能在开发版中使用。 在Rust 基金会成立以后,Rust 团队也在不断探索新的开源治理方案。 Rust 语言的不足 Rust 虽然有很多优势,但肯定也存在一些缺点。 Rust 编译速度很慢。虽然 Rust 官方也一直在改进 Rust 编译速度,包括增量编译支持,引入...
diagnostic_item = "Vec")] #[rustc_insignificant_dtor] pub struct Vec<T, #[unstable(feature =...