#6031: Cannot derive instances for empty datatypes defined in other modules
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Reporter: dreixel | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.5 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Comment(by simonpj@…):
commit bf6f7085c62370081d4fe421202ec31c9e51bcb4
{{{
Author: Simon Peyton Jones <[email protected]>
Date: Sun Apr 22 16:24:07 2012 +0100
Empty data types should not be "trimmed" by TidyPgm
That in turn means that you can derive Show etc in other modules,
fixing Trac #6031
compiler/main/TidyPgm.lhs | 26 +++++++++++++++++---------
1 files changed, 17 insertions(+), 9 deletions(-)
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6031#comment:1>
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