Comments (2)
(Imported. Original comment by [email protected] on January 23, 2012, 12:44:41 PM UTC)
Another way to reproduce this:
Prelude Diagrams.Prelude> :type (\x -> (x :: V (Point (Double,Double)))) (4,5)
:1:9:
Couldn't match type V (Point (Double, Double))' with
(t0, t1)'
In the expression: (x :: V (Point (Double, Double)))
In the expression: \ x -> (x :: V (Point (Double, Double)))
In the expression:
(\ x -> (x :: V (Point (Double, Double)))) (4, 5)
Prelude Diagrams.Prelude> :m +Graphics.Rendering.Diagrams.Points
Prelude Diagrams.Prelude Graphics.Rendering.Diagrams.Points> :type (\x -> (x :: V (Point (Double,Double)))) (4,5)
(\x -> (x :: V (Point (Double,Double)))) (4,5) :: (Double, Double)
It seems this is likely a GHC bug, but I'd like to keep the ticket open here until we figure out a minimal test case to file as a GHC bug (or find an existing ticket).
I first encountered this problem when I split out most of the content of Graphics.Rendering.Diagrams.Points into the vector-space-points package. Currently the V instance is the only thing in the module.
Note that other V instances are defined in other modules and are re-exported via Diagrams.Prelude just fine. It's a mystery why the instance for Point is not.
from diagrams-core.
This seems to have been fixed in GHC 7.6.1; closing.
from diagrams-core.
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- A release with constraintskinds fix? HOT 3
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- Is it possible to serialize a diagram to a file and then render it with another program, another time? HOT 4
- diagrams-core introduced breaking change in a patch version HOT 5
- Relax upper bound constraints to build with base 4.15 HOT 21
- Support monoid-extras 0.6 and future versions of base (Option deprecation) HOT 2
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- Problem installing diagrams with cabal... HOT 3
- Drop "xlink:" namespace for SVG 2.0 HOT 2
- Allow specifying the "target" attribute for links in SVG elements
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from diagrams-core.