Create README.md

README.md

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+# repro-shadowed-deps
+repro for https://github.com/Gabriel439/haskell-nix/issues/56
+
+```
+libb >> nix-shell --command zsh
+these derivations will be built:
+  /nix/store/2ddm8i6my675a7lncm4frkcasprf5gxl-liba-0.1.0.0.drv
+  /nix/store/7wmsgz49759pff7ikky2nksxn8cckr63-ghc-8.4.3-with-packages.drv
+building '/nix/store/2ddm8i6my675a7lncm4frkcasprf5gxl-liba-0.1.0.0.drv'...
+setupCompilerEnvironmentPhase
+Build with /nix/store/nv4h00ma4lmwj9bnc8dhf9nzyj28d6ds-ghc-8.4.3.
+ignoring (possibly broken) abi-depends field for packages
+ignoring (possibly broken) abi-depends field for packages
+unpacking sources
+unpacking source archive /nix/store/nf0yf8xsi7l92ark5q08ddhrkh2syy9b-hi
+source root is hi
+patching sources
+compileBuildDriverPhase
+setupCompileFlags: -package-db=/private/tmp/nix-build-liba-0.1.0.0.drv-0/setup-package.conf.d -j1 -threaded
+Loaded package environment from /private/tmp/nix-build-liba-0.1.0.0.drv-0/hi/.ghc.environment.x86_64-darwin-8.4.3
+<command line>: cannot satisfy -package-id liba-0.1.0.0-inplace:
+    liba-0.1.0.0-inplace is unusable due to missing dependencies:
+      aeson-1.2.4.0-KPiiXcK6dELrtdAOauWhV
+    (use -v for more information)
+builder for '/nix/store/2ddm8i6my675a7lncm4frkcasprf5gxl-liba-0.1.0.0.drv' failed with exit code 1
+cannot build derivation '/nix/store/7wmsgz49759pff7ikky2nksxn8cckr63-ghc-8.4.3-with-packages.drv': 1 dependencies couldn't be built
+error: build of '/nix/store/7wmsgz49759pff7ikky2nksxn8cckr63-ghc-8.4.3-with-packages.drv' failed
+```