Cannot find macro llvm_asm

[imp]

Since parking_lot was updated to 0.10.1 I am getting this error

error: cannot find macro `llvm_asm` in this scope
  --> /.../.cargo/registry/src/6github.com-1ecc6299db9ec823/parking_lot-0.10.1/src/elision.rs:77:13
   |
77 |             llvm_asm!("xacquire; lock; cmpxchgq $2, $1"
   |             ^^^^^^^^

error: cannot find macro `llvm_asm` in this scope
   --> /.../.cargo/registry/src/6github.com-1ecc6299db9ec823/parking_lot-0.10.1/src/elision.rs:108:13
    |
108 |             llvm_asm!("xrelease; lock; xaddq $2, $1"
    |             ^^^^^^^^

Perhaps there needs to be some guidance regarding the minimal Rust version where this macro is supported?

[Amanieu]

This only happens if you are using the nightly feature. You need to update your nightly Rust.

[imp]

I am having some other (unrelated) issues with the today's nightly. What is the earliest nightly that will work?

[Amanieu]

The PR (rust-lang/rust#68404) landed on March 27, so any nightly after that.