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Jan 11, 2023
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Update print.md #1663

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9 changes: 6 additions & 3 deletions src/hello/print.md
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ fn main() {
// Only types that implement fmt::Display can be formatted with `{}`. User-
// defined types do not implement fmt::Display by default.

#[allow(dead_code)]
#[allow(dead_code)] // disable `dead_code` which warn against unused module
struct Structure(i32);

// This will not compile because `Structure` does not implement
Expand Down Expand Up @@ -89,6 +89,8 @@ for these types. To print text for custom types, more steps are required.
Implementing the `fmt::Display` trait automatically implements the
[`ToString`] trait which allows us to [convert] the type to [`String`][string].

In *line 46*, `#[allow(dead_code)]` is an [attribute] which only apply to the module after it.

### Activities

* Fix the issue in the above code (see FIXME) so that it runs without
Expand All @@ -102,8 +104,7 @@ Implementing the `fmt::Display` trait automatically implements the

### See also:

[`std::fmt`][fmt], [`macros`][macros], [`struct`][structs],
and [`traits`][traits]
[`std::fmt`][fmt], [`macros`][macros], [`struct`][structs], [`traits`][traits], and [`dead_code`][dead_code]

[fmt]: https://doc.rust-lang.org/std/fmt/
[macros]: ../macros.md
Expand All @@ -112,3 +113,5 @@ and [`traits`][traits]
[traits]: https://doc.rust-lang.org/std/fmt/#formatting-traits
[`ToString`]: https://doc.rust-lang.org/std/string/trait.ToString.html
[convert]: ../conversion/string.md
[attribute]: ../attribute.md
[dead_code]: ../attribute/unused.md