Changes between Version 17 and Version 18 of ReportABug


Ignore:
Timestamp:
Jan 15, 2013 10:15:36 AM (3 years ago)
Author:
monoidal
Comment:

frequent bugs

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  • ReportABug

    v17 v18  
    1010 * Less preferred:
    1111     * To submit an anonymous bug: use login "guest", password "guest"
     12
     13== Frequently reported bugs ==
     14
     15GHC 7.4 gives an internal error (panic) on:
     16
     17 * Lowercase identifier used in a deriving clause, such as {{{data A = B deriving show}}}. Use uppercase: {{{deriving Show}}}. Bug #5961.
     18 * Invalid instances: {{{instance A => B => C where ...}}}, {{{instance A -> B}}}, {{{instance (A, B)}}} etc. Bug #5951.
     19
     20Both errors are fixed in GHC 7.6, if possible, you should upgrade.
     21
     22GHC 7.6 gives a panic on an invalid strictness annotation {{{data X = X (!Maybe Int)}}}. The correct way is {{{data X = X (!(Maybe Int))}}}. This is fixed in the development version. See bug #7210.
    1223
    1324== How do I tell if I should report my bug? ==