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"bad substitution" error on darwin #71625

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#108102
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"bad substitution" error on darwin#71625
#108102
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0.kind: bugSomething is broken2.status: stalehttps://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md6.topic: darwinRunning or building packages on Darwin
@Ptival

Description

@Ptival
Ptival
opened on Oct 22, 2019

Describe the bug
Since this commit:
bbc5b22
Whenever I run commands like:
nix-shell -p hello
I get the following error:

/nix/store/v94xrmhkljhb44v2shcpv74gxg1ii1f1-cctools-binutils-darwin-wrapper/nix-support/setup-hook: line 140: ${role_pre}${cmd^^}=${cmd}: bad substitution

Additional context
My default shell is zsh, which has been the cause of some issues at times.

Metadata

 - system: `"x86_64-darwin"`
 - host os: `Darwin 18.7.0, macOS 10.14.6`
 - multi-user?: `no`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.3.1`
 - channels(root): `""`
 - channels(val): `"nixpkgs-20.03pre197510.4b0508a5853"`
 - nixpkgs: `/Users/val/.nix-defexpr/channels/nixpkgs`

Paging @xzfc in particular. Let me know how I can help!

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    0.kind: bugSomething is broken2.status: stalehttps://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md6.topic: darwinRunning or building packages on Darwin

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