Just alpha-rename a variable

diff --git a/compiler/typecheck/TcTyClsDecls.lhs b/compiler/typecheck/TcTyClsDecls.lhs
index 9e302c3..35b7d24 100644 (file)
--- a/compiler/typecheck/TcTyClsDecls.lhs
+++ b/compiler/typecheck/TcTyClsDecls.lhs
@@ -241,9 +241,9 @@ tcFamInstDecl (L loc decl)
     tcAddDeclCtxt decl                         $
     do { -- type families require -ftype-families and can't be in an
         -- hs-boot file
-       ; gla_exts <- doptM Opt_TypeFamilies
+       ; type_families <- doptM Opt_TypeFamilies
        ; is_boot  <- tcIsHsBoot          -- Are we compiling an hs-boot file?
-       ; checkTc gla_exts      $ badFamInstDecl (tcdLName decl)
+       ; checkTc type_families $ badFamInstDecl (tcdLName decl)
        ; checkTc (not is_boot) $ badBootFamInstDeclErr
 
         -- perform kind and type checking