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Explain use of debug! in tutorial #5916

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Apr 18, 2013
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Explain use of debug! in tutorial #5916

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3 changes: 3 additions & 0 deletions doc/tutorial.md
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Expand Up @@ -1669,6 +1669,9 @@ do spawn {
}
~~~~

If you want to see the output of `debug!` statements, you will need to turn on `debug!` logging.
To enable `debug!` logging, set the RUST_LOG environment variable to `debug` (e.g., with bash, `export RUST_LOG=debug`)

## For loops

The most common way to express iteration in Rust is with a `for`
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