#4055: Incorrect parsing of declarations
---------------------------------+------------------------------------------
Reporter: diatchki | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Parser)
Version: 6.12.2 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
---------------------------------+------------------------------------------
GHC's parser seems to accept incorrect Haskell programs, which leads to
very confusing error messages. Here is an example:
{{{
f x = T
g 1 = 10
g x
data T = T
}}}
When trying to compile this GHC reports:
{{{
test.hs:1:6: Not in scope: data constructor `T'
}}}
This happened in much larger module, where I had forgotten to complete one
of the equations for a function, but ended up looking for what is wrong
with the (completely unrelated) "data" declaration.
This might be related to Template Haskell because a smaller example---a
file containing only the literal 1---results in complaints about some
template Haskell type not being in the Num class.
I am compiling the module without any pragmas or flags, so I would not
think that TH is enabled.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4055>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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