#5125: SpecConstr messages should be reworded, and not be shown at standard
verbosity level
---------------------------------+------------------------------------------
Reporter: maltem | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.0.3 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
Currently GHC displays ''many'' messages about "specialisation over
constructors" that typically look like this:
{{{
SpecConstr
Function `$wks2{v s2dJ} [lid]'
has one call pattern, but the limit is 0
Use -fspec-constr-count=n to set the bound
Use -dppr-debug to see specialisations
}}}
Some things are wrong with the design of this message:
(1.) It is not apparent from the message if it is a fatal error, warning,
or debug information. (End users who install the Haskell platform often
think that something has gone wrong.)
(2.) It is not apparent from the message that it is comes from the
specialiser, unless you have read SpecConstr.lhs.
(3.) The message is shown at standard verbosity, but it probably
shouldn't.
(4.) -fspec-constr-count is referenced, but not documented.
See also #4288.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5125>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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