Type errors due to different package versions are a bit cryptic
Users of xmonad who've compiled one dependent library against X11 1.2, and then update X11, and attempt to recompile xmonad against the new X11 1.2.2, get a cryptic type error:
Couldn't match expected type `Graphics.X11.Xlib.Types.Display'
against inferred type `Display'Perhaps non-local types should be printed with their package name and version, which would clarify this error. Something like:
Couldn't match expected type `X11-1.2: Graphics.X11.Xlib.Types.Display'
against inferred type `X11-1.2.2: Display'Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.6.1 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | Unknown |
| Architecture | Unknown |