nix-shell: Set $IN_NIX_SHELL before evaluating
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@ -152,6 +152,8 @@ for (my $n = 0; $n < scalar @ARGV; $n++) {
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@exprs = ("./default.nix") if scalar @exprs == 0;
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$ENV{'IN_NIX_SHELL'} = 1 if $runEnv;
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foreach my $expr (@exprs) {
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@ -193,8 +195,6 @@ foreach my $expr (@exprs) {
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$ENV{'NIX_STORE'} = $Nix::Config::storeDir;
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$ENV{$_} = $drv->{env}->{$_} foreach keys %{$drv->{env}};
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$ENV{'IN_NIX_SHELL'} = 1;
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# Run a shell using the derivation's environment. For
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# convenience, source $stdenv/setup to setup additional
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# environment variables and shell functions. Also don't lose
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