Constraint synonym with Implicit Parameter
This:
{-# LANGUAGE ConstraintKinds, ImplicitParams #-}
module Foo where
type Foo = ?foo::()gives
Foo.hs:3:1: error:
• Illegal implicit parameter ‘?foo::()’
• In the type synonym declaration for ‘Foo’in GHC HEAD. It used to work in GHC-7.10. Did not check GHC-8.0.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
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| Blocking | |
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| Operating system | |
| Architecture |