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-rw-r--r--src/doc/book/listings/ch07-managing-growing-projects/listing-07-20/src/lib.rs1
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diff --git a/src/doc/book/listings/ch07-managing-growing-projects/listing-07-20/src/lib.rs b/src/doc/book/listings/ch07-managing-growing-projects/listing-07-20/src/lib.rs
new file mode 100644
index 000000000..341f40a47
--- /dev/null
+++ b/src/doc/book/listings/ch07-managing-growing-projects/listing-07-20/src/lib.rs
@@ -0,0 +1 @@
+use std::io::{self, Write};