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https://issues.apache.org/jira/browse/THRIFT-3394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14974399#comment-14974399
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Tom Lippincott commented on THRIFT-3394:
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Just attached a patch: does this look reasonable?
> compiler generates uncompilable code
> ------------------------------------
>
> Key: THRIFT-3394
> URL: https://issues.apache.org/jira/browse/THRIFT-3394
> Project: Thrift
> Issue Type: Bug
> Components: Haskell - Compiler
> Affects Versions: 0.9.3
> Environment: Linux x86-64, GHC 7.8 and 7.10
> Reporter: Tom Lippincott
> Attachments: thrift-3394-haskell-negation-fix.patch
>
>
> When given an input with a line like "2: optional i32 anchorTokenIndex = -1",
> thrift generates code like "tokenRefSequence_anchorTokenIndex = P.Just -1",
> but without parentheses around or a dollar sign preceding it, the negative
> part of the literal gets treated as a function and this can't compile,
> leading to:
> Not in scope: ‘-’
> Perhaps you meant ‘P.-’ (imported from Prelude)
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