diff options
Diffstat (limited to 'src/doc/book/listings/ch18-patterns-and-matching/listing-18-18')
3 files changed, 29 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.lock b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.lock new file mode 100644 index 000000000..2b4fa2903 --- /dev/null +++ b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "patterns" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.toml b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.toml new file mode 100644 index 000000000..82fe057bb --- /dev/null +++ b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "patterns" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/src/main.rs b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/src/main.rs new file mode 100644 index 000000000..b776c64c4 --- /dev/null +++ b/src/doc/book/listings/ch18-patterns-and-matching/listing-18-18/src/main.rs @@ -0,0 +1,17 @@ +fn main() { + // ANCHOR: here + let mut setting_value = Some(5); + let new_setting_value = Some(10); + + match (setting_value, new_setting_value) { + (Some(_), Some(_)) => { + println!("Can't overwrite an existing customized value"); + } + _ => { + setting_value = new_setting_value; + } + } + + println!("setting is {:?}", setting_value); + // ANCHOR_END: here +} |