Error: nu::parser::name_is_builtin_var
x `env` used as variable name.
,-[/Users/master/cyber/nox/.worktrees/no-std-dependencies/nox/audit/2026-10-17-published-api-baseline/compare.nu:38:17]
37 | let name = $'($side)-($feature)'
38 | let env = ($environment | upsert CARGO_TARGET_DIR ($cache | path join $name))
: ^|^
: `-- already a builtin variable
39 | let feature_args = (if $feature == std { [--features std] } else { [] })
`----
help: 'env' is the name of a builtin Nushell variable and cannot be used as
a variable name