Timothy Emiola

@alpmestan just checking in - this is approved, so I assume a maintainer will merge it ?

Turning on --show-trace gives: ``` error: while evaluating the attribute 'buildInputs' of the derivation 'rokubanme-no-purojekuto-1.0.0' at /nix/store/ispccm8khhpmz10d8nf9mlnjd1mjlwpv-nixpkgs-18.09pre134915.0288f77c300/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11: while evaluating the attribute 'propagatedBuildInputs' of the derivation 'foldl-1.3.7' at /nix/store/ispccm8khhpmz10d8nf9mlnjd1mjlwpv-nixpkgs-18.09pre134915.0288f77c300/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11: while evaluating...

This points to the fact that there is an issue building optparse-applicative from the json file. > while evaluating the attribute > 'nativeBuildInputs' of the derivation > 'cabal2nix-optparse-applicative' at /nix/store/ispccm8khhpmz10d8nf9mlnjd1mjlwpv-nixpkgs-18.09pre134915.0288f$7c300/nixpkgs/pkgs/stdenv/generic/make-derivation.nix:148:11:...

During the implementation #35, it became clear that this problem affects the foldl package as well.