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Make "Duplicate version tags" crash a compile-time error #14

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nh2 opened this issue May 16, 2014 · 0 comments

nh2 commented May 16, 2014

My program just crashed at run-time with

ghc: Duplicate version tags: [2,2,1]

because I wrote

deriveSafeCopy 2 'extension ''Mytype_v2
deriveSafeCopy 2 'extension ''Mytype_v3

when I meant deriveSafeCopy 3 'extension ''Mytype_v3.

Since I use deriveSafeCopy which is TemplateHaskell, it would be great if this mistake could be pointed out to me at compile time.

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