Error found:
in module Main
at tests/purs/failing/InstanceSigsIncorrectType.purs:8:1 - 10:13 (line 8, column 1 - line 10, column 13)

  Could not match type
           
    Boolean
           
  with type
          
    Number
          

while trying to match type Foo$Dict t0
  with type Foo$Dict Number
while checking that expression Foo$Dict { foo: true
                                        }          
  has type Foo$Dict Number
in value declaration fooNumber

where t0 is an unknown type

See https://github.com/purescript/documentation/blob/master/errors/TypesDoNotUnify.md for more information,
or to contribute content related to this error.