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diff --git a/compiler/typecheck/TcSimplify.lhs b/compiler/typecheck/TcSimplify.lhs
index cd3da49..7aaa1ae 100644 (file)
--- a/compiler/typecheck/TcSimplify.lhs
+++ b/compiler/typecheck/TcSimplify.lhs
@@ -2856,6 +2856,7 @@ disambiguate doc interactive dflags insts
 
   where
    extended_defaulting = interactive || dopt Opt_ExtendedDefaultRules dflags
+                      -- See also Trac #1974
    ovl_strings = dopt Opt_OverloadedStrings dflags
 
    unaries :: [(Inst, Class, TcTyVar)]  -- (C tv) constraints