rust在禁用标准库后，编译器又去检查std，出现重复定义报错

rust在禁用标准库后，编译器又去检查std，出现重复定义报错

#![no_std]
fn main() {}

use core::panic::PanicInfo;

/// 这个函数将在 panic 时被调用
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {}
}

//此时出现检查报错
//found duplicate lang item `panic_impl`
the lang item is first defined in crate `std` (which `test` depends on)
first definition in `std` loaded from \\?\C:\Users\zheng'du'niao\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\x86_64-pc-windows-msvc\lib\libstd-9505d954cc550ca4.rlib
second definition in the local crate (`genius`)rustcE0152

说明还是去查了std库，而我在前面已经禁用std了，print！宏也失效了，代表确实没有引std，但这里却出现了矛盾

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