Use level numbers for generalisation
GHC's type inference engine goes to quite a bit of effort to pin a level number on every type variable (both skolems and unification variables).
Idea: when generalising a type or kind, use those level numbers to decide which variables to generalise.
This could completely replace the "global tyvars" field of the TcLclEnv
(the tcl_tyvars
field), which is very tiresome to maintain.
Trac metadata
Trac field | Value |
---|---|
Version | 8.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
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Blocking | |
CC | |
Operating system | |
Architecture |