diff options
Diffstat (limited to 'src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed')
4 files changed, 39 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.lock b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.lock new file mode 100644 index 000000000..2aa4918e5 --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "ownership" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.toml b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.toml new file mode 100644 index 000000000..e8847526d --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "ownership" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/output.txt b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/output.txt new file mode 100644 index 000000000..df94c30e9 --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/output.txt @@ -0,0 +1,16 @@ +$ cargo run + Compiling ownership v0.1.0 (file:///projects/ownership) +error[E0502]: cannot borrow `s` as mutable because it is also borrowed as immutable + --> src/main.rs:6:14 + | +4 | let r1 = &s; // no problem + | -- immutable borrow occurs here +5 | let r2 = &s; // no problem +6 | let r3 = &mut s; // BIG PROBLEM + | ^^^^^^ mutable borrow occurs here +7 | +8 | println!("{}, {}, and {}", r1, r2, r3); + | -- immutable borrow later used here + +For more information about this error, try `rustc --explain E0502`. +error: could not compile `ownership` due to previous error diff --git a/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs new file mode 100644 index 000000000..0da04c010 --- /dev/null +++ b/src/doc/book/listings/ch04-understanding-ownership/no-listing-12-immutable-and-mutable-not-allowed/src/main.rs @@ -0,0 +1,11 @@ +fn main() { + // ANCHOR: here + let mut s = String::from("hello"); + + let r1 = &s; // no problem + let r2 = &s; // no problem + let r3 = &mut s; // BIG PROBLEM + + println!("{}, {}, and {}", r1, r2, r3); + // ANCHOR_END: here +} |