[...]

lable branches: master
rust-bindgen-0.63.0.tar.gz having proper md5sum already exists
rust-bindgen-crates-0.63.0.tar.xz having proper md5sum already exists
./builder[2756]: ulimit: exceeds allowable limit
warning: Macro expanded in comment on line 9: %{version}
warning: Macro expanded in comment on line 12: %{version}.tar.xz cbindgen-%{version}/{vendor,Cargo.lock}
Building target platforms: i686-linux
Building for target i686-linux
Wrote: /home/users/builder/rpm/SRPMS/rust-bindgen-0.63.0-1.src.rpm
real 0.46
user 0.43
sys 0.01
warning: Macro expanded in comment on line 9: %{version}
warning: Macro expanded in comment on line 12: %{version}.tar.xz cbindgen-%{version}/{vendor,Cargo.lock}
Writing git revision for tag tld/rust-bindgen-0.63.0-1
error: Macro %_builddir has empty body
Begin-TLD-Builder-Info
Build-Time: user:1.43s sys:0.43s real:13.12s (faults io:404 non-io:99541)
Files queued for ftp:
   9626571 rust-bindgen-0.63.0-1.src.rpm
       191 rust-bindgen-0.63.0-1.src.rpm.uploadinfo
End-TLD-Builder-Info