Build failure with aeson 1.0

[snoyberg]

> /tmp/stackage-build8$ stack unpack smsaero-0.6.1
Unpacked smsaero-0.6.1 to /tmp/stackage-build8/smsaero-0.6.1/
> /tmp/stackage-build8/smsaero-0.6.1$ runghc -clear-package-db -global-package-db -package-db=/var/stackage/work/builds/nightly/pkgdb Setup configure --package-db=clear --package-db=global --package-db=/var/stackage/work/builds/nightly/pkgdb --libdir=/var/stackage/work/builds/nightly/lib --bindir=/var/stackage/work/builds/nightly/bin --datadir=/var/stackage/work/builds/nightly/share --libexecdir=/var/stackage/work/builds/nightly/libexec --sysconfdir=/var/stackage/work/builds/nightly/etc --docdir=/var/stackage/work/builds/nightly/doc/smsaero-0.6.1 --htmldir=/var/stackage/work/builds/nightly/doc/smsaero-0.6.1 --haddockdir=/var/stackage/work/builds/nightly/doc/smsaero-0.6.1 --flags=
Configuring smsaero-0.6.1...
> /tmp/stackage-build8/smsaero-0.6.1$ runghc -clear-package-db -global-package-db -package-db=/var/stackage/work/builds/nightly/pkgdb Setup build
Building smsaero-0.6.1...
Preprocessing library smsaero-0.6.1...
[1 of 4] Compiling SMSAero.Types    ( src/SMSAero/Types.hs, dist/build/SMSAero/Types.o )
[2 of 4] Compiling SMSAero.API      ( src/SMSAero/API.hs, dist/build/SMSAero/API.o )

src/SMSAero/API.hs:100:10: warning: [-Wredundant-constraints]
    • Redundant constraint: KnownSymbol sym
    • In the instance declaration for
        ‘HasDocs (RequiredQueryParam sym a :> sub)’
[3 of 4] Compiling SMSAero.Client   ( src/SMSAero/Client.hs, dist/build/SMSAero/Client.o )

src/SMSAero/Client.hs:50:17: error:
    • Overlapping instances for aeson-1.0.0.0:Data.Aeson.Types.FromJSON.FromJSON
                                  (containers-0.5.7.1:Data.Map.Base.Map MessageId MessageStatus)
        arising from a use of ‘client’
      Matching instances:
        two instances involving out-of-scope types
        (use -fprint-potential-instances to see them all)
    • In the expression: client (Proxy :: Proxy SMSAeroAPI)
      In an equation for ‘smsAeroClient’:
          smsAeroClient = client (Proxy :: Proxy SMSAeroAPI)