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| author | simonpj@microsoft.com <unknown> | 2007-11-28 15:05:41 +0000 |
|---|---|---|
| committer | simonpj@microsoft.com <unknown> | 2007-11-28 15:05:41 +0000 |
| commit | 162ae90572443ca726992ea54f4cbc75658453d3 (patch) | |
| tree | 09841929a5930a5e21c227bdb0a1537f1f1eb1e7 /compiler/utils/StringBuffer.lhs | |
| parent | b566be3509bacb565acb5fbda67a93967bd99359 (diff) | |
| download | haskell-162ae90572443ca726992ea54f4cbc75658453d3.tar.gz | |
FIX Trac #1935: generate superclass constraints for derived classes
This bug only reports a problem with phantom types, but actually
there was quite a long-standing and significant omission in the
constraint generation for derived classes. See
Note [Superclasses of derived instance] in TcDeriv.
The test deriving-1935 tests both cases.
Diffstat (limited to 'compiler/utils/StringBuffer.lhs')
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