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Make rule-matching robust to lets
[ghc-hetmet.git]
/
compiler
/
coreSyn
/
CoreTidy.lhs
diff --git
a/compiler/coreSyn/CoreTidy.lhs
b/compiler/coreSyn/CoreTidy.lhs
index
ba60466
..
6f13740
100644
(file)
--- a/
compiler/coreSyn/CoreTidy.lhs
+++ b/
compiler/coreSyn/CoreTidy.lhs
@@
-81,7
+81,7
@@
tidyAlt case_bndr env (DataAlt con, vs, rhs)
| not (isVanillaDataCon con) -- GADT case
= tidyBndrs env tvs =: \ (env1, tvs') ->
let
| not (isVanillaDataCon con) -- GADT case
= tidyBndrs env tvs =: \ (env1, tvs') ->
let
- env2 = refineTidyEnv env con tvs' scrut_ty
+ env2 = refineTidyEnv env1 con tvs' scrut_ty
in
tidyBndrs env2 ids =: \ (env3, ids') ->
(DataAlt con, tvs' ++ ids', tidyExpr env3 rhs)
in
tidyBndrs env2 ids =: \ (env3, ids') ->
(DataAlt con, tvs' ++ ids', tidyExpr env3 rhs)