# HG changeset patch
# User ballarin
# Date 1520000099 -3600
# Node ID 6306bd5829576d2b862181d4b175191d1f647211
# Parent  d5a7f2c5465552d67c7ba51c021f21235aaa0a2a
Drop illegitimate optimisation from d5a7f2c54655.

diff -r d5a7f2c54655 -r 6306bd582957 src/Pure/Isar/expression.ML
--- a/src/Pure/Isar/expression.ML	Fri Mar 02 14:28:39 2018 +0100
+++ b/src/Pure/Isar/expression.ML	Fri Mar 02 15:14:59 2018 +0100
@@ -407,8 +407,7 @@
           |> Variable.export_terms ctxt' ctxt
           |> Element.eq_term_morphism (Proof_Context.theory_of ctxt)
           |> the_default Morphism.identity;
-       val ctxt'' = if null eqns then ctxt' else 
-         Locale.activate_declarations (loc, inst_morph $> rewrite_morph) ctxt;
+       val ctxt'' = Locale.activate_declarations (loc, inst_morph $> rewrite_morph) ctxt;
        val eqnss' = eqnss @ [attrss ~~ Variable.export_terms ctxt' ctxt eqns'];
       in (i + 1, insts', eqnss', ctxt'') end;