#11409: Cannot instantiate literals using TypeApplications -------------------------------------+------------------------------------- Reporter: Feuerbach | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: 8.4.1 Component: Compiler | Version: 8.0.1-rc1 Resolution: | Keywords: | TypeApplications Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #11352 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by Iceland_jack: Old description:
{{{ GHCi, version 8.0.1.20160110: http://www.haskell.org/ghc/ :? for help Prelude> :set -XTypeApplications -fprint-explicit-foralls Prelude> :t 42 42 :: forall {a}. Num a => a Prelude> 42 @Int
<interactive>:3:1: error: • Cannot not apply expression of type ‘a0’ to a visible type argument ‘Int’ • In the expression: 42 @Int In an equation for ‘it’: it = 42 @Int }}}
(Also, "cannot not" looks like a typo.)
New description: Relevant [https://www.reddit.com/r/haskell/comments/60seia/type_application_on_literal... reddit post]. ---- {{{ GHCi, version 8.0.1.20160110: http://www.haskell.org/ghc/ :? for help Prelude> :set -XTypeApplications -fprint-explicit-foralls Prelude> :t 42 42 :: forall {a}. Num a => a Prelude> 42 @Int <interactive>:3:1: error: • Cannot not apply expression of type ‘a0’ to a visible type argument ‘Int’ • In the expression: 42 @Int In an equation for ‘it’: it = 42 @Int }}} (Also, "cannot not" looks like a typo.) -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11409#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler