The ru_local field of a CoreRule is False for implicit Ids

[ghc-hetmet.git] / compiler / coreSyn / CoreSyn.lhs

diff --git a/compiler/coreSyn/CoreSyn.lhs b/compiler/coreSyn/CoreSyn.lhs
index 09e41aa..9b9d8fa 100644 (file)
--- a/compiler/coreSyn/CoreSyn.lhs
+++ b/compiler/coreSyn/CoreSyn.lhs
@@ -218,6 +218,10 @@ data CoreRule
        -- Locality
        ru_local :: Bool        -- The fn at the head of the rule is
                                -- defined in the same module as the rule
+                               -- and is not an implicit Id (like a record sel
+                               -- class op, or data con)
+               -- NB: ru_local is *not* used to decide orphan-hood
+               --      c.g. MkIface.coreRuleToIfaceRule
     }
 
   | BuiltinRule {              -- Built-in rules are used for constant folding