no such file, mv, buildRustCrate

build.sh

      build_bin() {
        crate_name=$1
        crate_name_=$(echo $crate_name | sed -e 's/-/_/g')
        main_file=""
        if [[ ! -z $2 ]]; then
          main_file=$2
        fi
        echo_build_heading $@
        noisily rustc --crate-name $crate_name_ $main_file --crate-type bin ${rustcOpts}\
          ${crateFeatures} --out-dir target/bin --emit=dep-info,link -L dependency=target/deps \
          $LINK ${deps}$EXTRA_LIB --cap-lints allow \
          $BUILD_OUT_DIR $EXTRA_BUILD $EXTRA_FEATURES --color ${colors}
        if [ "$crate_name" != "$crate_name_" ]; then
          ls -la target/bin/
          stat target/bin/$crate_name_
          noisily mv target/bin/$crate_name_ target/bin/$crate_name
        fi
      }

foo.log

Building brotli-decompressor (src/bin/brotli-decompressor.rs)
Running rustc --crate-name brotli_decompressor src/bin/brotli-decompressor.rs --crate-type bin -C opt-level=3 -C codegen-units=1 --cfg feature="default" --out-dir target/bin --emit=dep-info,link -L dependency=target/deps --extern alloc_no_stdlib=/nix/store/z6p3zx52nv16mmvwxq6kqw014xdan2ig-rust_alloc-no-stdlib-1.3.0/lib/liballoc_no_stdlib-d9894210fc.rlib --extern brotli_decompressor=target/lib/libbrotli_decompressor-938c1fd840.rlib --cap-lints allow --color always
total 824
drwxr-xr-x 2 nixbld nixbld     80 Sep 13 18:35 .
drwxrwxrwx 7 nixbld nixbld    200 Sep 13 18:35 ..
-rwxr-xr-x 1 nixbld nixbld 839384 Sep 13 18:35 brotli_decompressor
-rw-r--r-- 1 nixbld nixbld    302 Sep 13 18:35 brotli_decompressor.d
  File: target/bin/brotli_decompressor
  Size: 839384          Blocks: 1640       IO Block: 4096   regular file
Device: 28h/40d Inode: 1380653     Links: 1
Access: (0755/-rwxr-xr-x)  Uid: ( 1000/  nixbld)   Gid: (  100/  nixbld)
Access: 2018-09-13 18:35:58.090601725 +0000
Modify: 2018-09-13 18:35:58.090601725 +0000
Change: 2018-09-13 18:35:58.090601725 +0000
 Birth: -
Running mv target/bin/brotli_decompressor target/bin/brotli-decompressor
mv: cannot stat 'target/bin/brotli_decompressor': No such file or directory
builder for '/nix/store/drv9iwpl3vrc08b9cx9y0vhq80vc1lqw-rust_brotli-decompressor-1.3.1.drv' failed with exit code 1