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  • Glasgow Haskell Compiler
  • GHCGHC
  • Issues
  • #416
Closed
Open
Created Jul 07, 2005 by nobody@trac-nobody

instance of synonym

The following non-Haskell 98 instance is accepted even
without -fglasgow-exts:

type Foo = Double
instance Bounded Foo

The error message quotes the relevant part of the
Report (The instance type must be of form (T a b c)
where T is not a synonym, and a,b,c are distinct type
variables) and the code expresses this, but it seems
that type synonyms have already been expanded, so only
non-saturated ones are left at this stage.

ross@soi.city.ac.uk
Trac metadata
Trac field Value
Version None
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution ResolvedFixed
Component Compiler (Type checker)
Test case
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