error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `incompatible_fixedx18`
  --> $DIR/incompatible_fixedx18.rs:12:1
   |
LL | #![feature(no_core)]
   | ^
   |
   = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely
   = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `fixed_x18`
   = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `fixed_x18`
   = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error

error: aborting due to 1 previous error