Quoting Stefan O'Rear <[EMAIL PROTECTED]>:
On Mon, Sep 17, 2007 at 04:15:10PM +1200, Tom Pledger wrote:
Norman Ramsey wrote:
:
| This code fails to compile because the compiler is willing to
| use 'fold' at only one type (CmmExpr as it happens)
:
When it failed to compile, was
fold = foldRegsUsed
a top-level declaration in the module, rather than local to foldRegsUsed?
If so, try working around the monomorphism restriction by changing from a
pattern binding to a function binding.
fold f = foldRegsUsed f
The monomorphism restriction is not affected by top-level-or-not, see
sections 4.5.1 and 4.5.5 in the Haskell 98 Language and Libraries
Report.
Stefan
Aargh! Sorry, I'm having a Bad Details Day. 3 in 1 message:
- Overlooking the "to make the code work, I had to expand 'fold'
into 'foldRegsUsed' everywhere it appears" part in the original
question,
- Chopping a letter out of Norman's email address, and
- Mixing up the MR with other issues, possibly something from the
binding groups section of Typing Haskell In Haskell.
The one saving grace is that I tested my suggestion before posting,
and it worked. :-)
- Tom
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