[GHC] #8081: let form in do block requires in?
GHC
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Mon Jul 22 06:47:02 CEST 2013
#8081: let form in do block requires in?
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Reporter: dsamperi | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.3
Keywords: | Operating System: Linux
Architecture: x86_64 | Type of failure: GHC rejects valid program
(amd64) | Test Case:
Difficulty: Unknown | Blocking:
Blocked By: |
Related Tickets: |
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According to the 2010 Haskell spec the following should be equivalent:
do1 = do { let x = 3.14 ; return x }
and
do2 = let x = 3.14 in do { return x }
But ghc 7.6.3 chokes on the first (do1) with "parse error on input '}'"
On the other hand, if I use layout and set
do3 = do
let x = 3.14
return x
there is no problem. Also, the compiler doesn't complain if I insert
"in" in place of the semicolon in do1 (but this doesn't seem to
follow the spec).
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8081>
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