#5542: also parse class/instance declarations as "HEAD <= CONTEXT where"
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Reporter: nfrisby | Owner:
Type: feature request | Status: new
Priority: normal | Component: Compiler (Parser)
Version: 7.2.1 | Keywords:
Testcase: | Blockedby:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by porges):
I just added <= as a reserved word into Lexer.x and then in Parser.y
duplicated all mentions of => with <= as well. Doing this adds about 10
shift/reduce conflicts and 5 or so reduce/reduce conflicts.
It does compile and work, but things like this make GHC panic:
instance Show a => Foo a <= Show a where
:)
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5542#comment:1>
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