#15867: STG scope error
-------------------------------------+-------------------------------------
Reporter: csabahruska | Owner: sgraf
Type: bug | Status: patch
Priority: normal | Milestone:
Component: Compiler | Version: 8.7
Resolution: | Keywords: CodeGen
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D5310
Wiki Page: |
-------------------------------------+-------------------------------------
Comment (by csabahruska):
I've improved the scope checking:
- allows unique name shadowing (nested scopes)
- checks OccName duplications only for exported top-level names
- check Unique duplications for StgRhsClosure, StgRec, DataAlt
I've attached the improved linter patch. (StgScopeCheck2.patch). It
requires the `nub` fix.
Using this improvements I've got new errors:
{{{
buggy source: libraries/base/Data/Type/Equality.hs
*** Stg Lint ErrMsgs: in Unarise ***
<no location info>: warning:
[in body of lambda with binders void_0E :: Void#,
void_0E :: Void#]
void_0E :: Void# is duplicated (Uniq)
*** Offending Program ***
HRefl
:: forall k2 k2 (a :: k2) (b :: k2).
(k2 ~# k2) -> (b ~# a) -> a :~~: b
[GblId[DataCon],
Arity=2,
Caf=NoCafRefs,
Str=