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-rw-r--r--example/math_expression/stack.go2
1 files changed, 2 insertions, 0 deletions
diff --git a/example/math_expression/stack.go b/example/math_expression/stack.go
index 2ca8acc..b6c37b9 100644
--- a/example/math_expression/stack.go
+++ b/example/math_expression/stack.go
@@ -1,3 +1,5 @@
+// +build example
+
package main
// Simple lexem stack implementation.