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-rw-r--r--compiler/basicTypes/MkId.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/basicTypes/MkId.hs b/compiler/basicTypes/MkId.hs
index 6895677a8f..ad584a325e 100644
--- a/compiler/basicTypes/MkId.hs
+++ b/compiler/basicTypes/MkId.hs
@@ -1088,7 +1088,7 @@ proxyHashId
ty = mkForAllTys [kv, tv] (mkProxyPrimTy k t)
kv = kKiVar
k = mkTyVarTy kv
- tv:_ = tyVarList k
+ [tv] = mkTemplateTyVars [k]
t = mkTyVarTy tv
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