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-rw-r--r--src/elixir_math_parser.yrl1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/elixir_math_parser.yrl b/src/elixir_math_parser.yrl
index 006c768..f8de916 100644
--- a/src/elixir_math_parser.yrl
+++ b/src/elixir_math_parser.yrl
@@ -50,6 +50,7 @@ expr -> exprs '/' exprs : {div_op, '$1', '$3'}.
expr -> expr '!' : {factor_op, '$1'}.
expr -> exprs '^' exprs : {exp_op, '$1', '$3'}.
expr -> '(' exprs ')' : '$2'.
+expr -> '-' exprs : {sub_op, {int, 0, 0}, '$2'}.
Erlang code.