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Clarify default vs debug output.

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Martin Geisler 2023-01-11 10:49:21 +01:00 committed by GitHub
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src/basic-syntax/compound-types.md
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@ -47,7 +47,7 @@ a[n+15] = 11 // index out of bounds error since len is 10
assert!(n+20 < a.len()); // panics
```
*In the main function, the print statement contains the debug implementation {a :?}.
*In the main function, the print statement asks for the debug implementation with the `?` format parameter: `{a}` gives default output, `{a:?}` gives debug output.
*Adding `#`, eg `{a:#?}`, invokes a "pretty printing" format, which can be easier to read.