GHC 7.10->8.0 regression: GHC code-generates duplicate _closures

Giving GHC 8.0.2rc2 a closer look I stumbled over this one:

This works fine in GHC 7.10.3, but fails to compile with GHC 8.0.2rc2:

Resolving dependencies...
In order, the following will be built (use -v for more details):
 - vivid-0.1.0.3 {vivid-0.1.0.3-inplace} (lib) (first run)
Configuring component lib from vivid-0.1.0.3...
Preprocessing library vivid-0.1.0.3...
[ 1 of 10] Compiling Vivid.SynthDef.Types ( Vivid/SynthDef/Types.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/SynthDef/Types.o )
[ 2 of 10] Compiling Vivid.SynthDef.CrazyTypes ( Vivid/SynthDef/CrazyTypes.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/SynthDef/CrazyTypes.o )
[ 3 of 10] Compiling Vivid.OSC.Util   ( Vivid/OSC/Util.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/OSC/Util.o )
[ 4 of 10] Compiling Vivid.SynthDef.Literally ( Vivid/SynthDef/Literally.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/SynthDef/Literally.o )
[ 5 of 10] Compiling Vivid.OSC        ( Vivid/OSC.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/OSC.o )
[ 6 of 10] Compiling Vivid.SCServer   ( Vivid/SCServer.hs, /tmp/vivid-0.1.0.3/dist-newstyle/build/x86_64-linux/ghc-8.0.1.20161213/vivid-0.1.0.3/build/Vivid/SCServer.o )
/tmp/ghc12095_0/ghc_27.s: Assembler messages:

/tmp/ghc12095_0/ghc_27.s:5860:0: error:
     Error: symbol `vividzm0zi1zi0zi3zminplace_VividziSCServer_scServerState_closure' is already defined

/tmp/ghc12095_0/ghc_27.s:10988:0: error:
     Error: symbol `vividzm0zi1zi0zi3zminplace_VividziSCServer_scServerState_closure' is already defined

/tmp/ghc12095_0/ghc_27.s:11751:0: error:
     Error: symbol `vividzm0zi1zi0zi3zminplace_VividziSCServer_scServerState_closure' is already defined
`gcc' failed in phase `Assembler'. (Exit code: 1)

Trac metadata

Trac field	Value
Version	8.0.2-rc2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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