[Haskell-cafe] Numerals in input vs numerals in source

[Brandon Allbery]

On Tue, Sep 23, 2014 at 11:19 PM, Doug McIlroy <doug at cs.dartmouth.edu>
wrote:

> Yet (1::Integer, 1::Rational, 1::Double) evaluates to (1, 1%1, 1.0)
>
> Is the inconsistent parsing defensible, or just an (irrational!) fact?
> I believe a reconciliation would break nothing.
>

The parsing is the same; read is not expected to throw a fromIntegral into
the mix, whereas the compiler is required to. (The 1 is parsed as Integer
by the compiler in all three cases, but the resulting AST is (fromIntegral
1) in all three cases.)

I suspect a Read instance that included a fromIntegral would be even more
irrational.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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