A name for omitted definitions.
acme-omitted provides a way of indicating that a definition has been "omitted" (though not inherently undefinable), an alternative to "Prelude.undefined", and the means to observe the difference.
3.0.0.0aarch64-darwinaarch64-freebsdaarch64-genodeaarch64-linuxaarch64-netbsdaarch64-noneaarch64-windowsaarch64_be-nonearm-nonearmv5tel-linuxarmv6l-linuxarmv6l-netbsdarmv6l-nonearmv7a-darwinarmv7a-linuxarmv7a-netbsdarmv7l-linuxarmv7l-netbsdavr-nonei686-cygwini686-darwini686-freebsdi686-genodei686-linuxi686-netbsdi686-nonei686-openbsdi686-windowsjavascript-ghcjsloongarch64-linuxm68k-linuxm68k-netbsdm68k-nonemicroblaze-linuxmicroblaze-nonemicroblazeel-linuxmicroblazeel-nonemips-linuxmips-nonemips64-linuxmips64-nonemips64el-linuxmipsel-linuxmipsel-netbsdmmix-mmixwaremsp430-noneor1k-nonepowerpc-netbsdpowerpc-nonepowerpc64-linuxpowerpc64le-linuxpowerpcle-noneriscv32-linuxriscv32-netbsdriscv32-noneriscv64-linuxriscv64-netbsdriscv64-nonerx-nones390-linuxs390-nones390x-linuxs390x-nonevc4-nonewasm32-wasiwasm64-wasix86_64-cygwinx86_64-darwinx86_64-freebsdx86_64-genodex86_64-linuxx86_64-netbsdx86_64-nonex86_64-openbsdx86_64-redoxx86_64-solarisx86_64-windows