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-rw-r--r--source/Syntax/Lexicon.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/source/Syntax/Lexicon.hs b/source/Syntax/Lexicon.hs
index 463dd18..65072ee 100644
--- a/source/Syntax/Lexicon.hs
+++ b/source/Syntax/Lexicon.hs
@@ -95,6 +95,7 @@ builtinMixfix = Seq.fromList $ (HM.fromList <$>)
builtinIdentifiers = identifier <$>
[ "emptyset"
, "naturals"
+ , "integers"
, "rationals"
, "reals"
, "unit"