are patterns synonyms definable in GHCI?
Simon Peyton Jones
simonpj at microsoft.com
Thu Dec 18 11:13:00 UTC 2014
But GHCi does support data type declarations
ghci> data T = A | B
so presumably it ought also to support pattern synonym declarations.
| -----Original Message-----
| From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Dr.
| ERDI Gergo
| Sent: 18 December 2014 10:52
| To: Carter Schonwald
| Cc: ghc-devs at haskell.org
| Subject: Re: are patterns synonyms definable in GHCI?
| On Thu, 18 Dec 2014, Carter Schonwald wrote:
| > Hey all,I was trying to define some pattern synonyms in ghci
| > and that doesnt seem to work. Is that something slated to be fix in
| 7.10 or something?
| I thought GHCi accepts things that would be valid in a 'do' section?
| So e.g.
| x = ()
| doesn't work in GHCi, but
| let x = ()
| Pattern synonyms don't work for the exact same reason: they are not
| valid inside a 'do' block.
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