Warning out when "undefined" value has been used.
Programmer may like to use "undefined" to define a function or value, which usually means "later implementation".
However, people might forget to implement it thus cause run time error. Wish GHC will show some warning/errors at compilation.
This idea comes from this article (http://www.devalot.com/articles/2013/07/why-haskell.html)
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.6.3 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |