Add a total order on type constructors
Several proposals for ExtensibleRecords can be implemented as libraries if type constructors can be ordered globally.
This proposal is to add built-in types:
data LabelLT
data LabelEQ
data LabelGT
type family LabelCMP
such that, for any two datatypes
data N = N
data M = M
the instance LabelCMP N M
takes one of the values LabelLT, LabelEQ, LabelGT
depending on the lexicographic ordering on the fully-qualified names of N
and M
.
Trac metadata
Trac field | Value |
---|---|
Version | 6.8.1 |
Type | FeatureRequest |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Multiple |
Architecture | Multiple |