could not compile `std_detect` on FreeBSD aarch64 rust 1.59.0

[MikaelUrankar]

error log:

error: cannot find macro `asm` in this scope
  --> library/stdarch/crates/std_detect/src/detect/os/aarch64.rs:37:13
   |                                                                                                                           
37 |             asm!(       
   |             ^^^                                                                                                           
   |                                                                                                                           
   = note: consider importing this macro:                                                                                      
           core::arch::asm 
                                                                                                                               
error: cannot find macro `asm` in this scope
  --> library/stdarch/crates/std_detect/src/detect/os/aarch64.rs:52:13
   | 
52 |             asm!(               
   |             ^^^                          
   |
   = note: consider importing this macro:
           core::arch::asm

error: cannot find macro `asm` in this scope
  --> library/stdarch/crates/std_detect/src/detect/os/aarch64.rs:83:13
   |
83 |             asm!(
   |             ^^^
   |
   = note: consider importing this macro:
           core::arch::asm

[MikaelUrankar]

As noted in the error, importing "core::arch::asm" seems to fix it:

--- library/stdarch/crates/std_detect/src/detect/os/aarch64.rs.orig     2022-03-08 09:13:53.485340000 +0100
+++ library/stdarch/crates/std_detect/src/detect/os/aarch64.rs  2022-03-08 09:27:20.315462000 +0100
@@ -17,6 +17,7 @@
 //! - [Linux documentation](https://www.kernel.org/doc/Documentation/arm64/cpu-feature-registers.txt)
 
 use crate::detect::{cache, Feature};
+use core::arch::asm;
 
 /// Try to read the features from the system registers.
 ///

[lu-zero]

I reproduced the problem with -Z build-std, the pr should fix your problem.