#11793: Confusing type error from constrained class method -------------------------------------+------------------------------------- Reporter: gridaphobe | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 8.0.1-rc2 Resolution: | Keywords: error-message Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect | Unknown/Multiple warning at compile-time | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
Is this intended?
You are asking a question about a separate thing, unrelated to this ticket, namely the parsing of implicit parameter constraints. It looks as though they have to be in parens, as things stand. So {{{ f :: (?x::Int) => blah -- ok f :: ?x::Int => blah -- not ok }}} I see no fundamental reason why the second should be not-ok. By all means open a ticket, and offer a parser patch, if you think it's important. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11793#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler