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Diffstat (limited to 'compiler/simplCore/CoreMonad.lhs')
| -rw-r--r-- | compiler/simplCore/CoreMonad.lhs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/simplCore/CoreMonad.lhs b/compiler/simplCore/CoreMonad.lhs index faec02e9c6..ad4a0e1a1b 100644 --- a/compiler/simplCore/CoreMonad.lhs +++ b/compiler/simplCore/CoreMonad.lhs @@ -274,7 +274,7 @@ interactiveInScope hsc_env te1 = mkTypeEnvWithImplicits (ic_tythings ictxt) te = extendTypeEnvWithIds te1 (map instanceDFunId cls_insts) ids = typeEnvIds te - tyvars = foldr (unionVarSet . tyVarsOfType . idType) emptyVarSet ids + tyvars = mapUnionVarSet (tyVarsOfType . idType) ids -- Why the type variables? How can the top level envt have free tyvars? -- I think it's because of the GHCi debugger, which can bind variables -- f :: [t] -> [t] |