diff options
Diffstat (limited to 'src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable')
4 files changed, 34 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.lock b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.lock new file mode 100644 index 000000000..2d62cbe7a --- /dev/null +++ b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "variables" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.toml b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.toml new file mode 100644 index 000000000..4da3b8150 --- /dev/null +++ b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "variables" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/output.txt b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/output.txt new file mode 100644 index 000000000..ed87cb2c8 --- /dev/null +++ b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/output.txt @@ -0,0 +1,16 @@ +$ cargo run + Compiling variables v0.1.0 (file:///projects/variables) +error[E0384]: cannot assign twice to immutable variable `x` + --> src/main.rs:4:5 + | +2 | let x = 5; + | - + | | + | first assignment to `x` + | help: consider making this binding mutable: `mut x` +3 | println!("The value of x is: {x}"); +4 | x = 6; + | ^^^^^ cannot assign twice to immutable variable + +For more information about this error, try `rustc --explain E0384`. +error: could not compile `variables` due to previous error diff --git a/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/src/main.rs b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/src/main.rs new file mode 100644 index 000000000..d64f46de4 --- /dev/null +++ b/src/doc/book/listings/ch03-common-programming-concepts/no-listing-01-variables-are-immutable/src/main.rs @@ -0,0 +1,6 @@ +fn main() { + let x = 5; + println!("The value of x is: {x}"); + x = 6; + println!("The value of x is: {x}"); +} |