diff options
| -rw-r--r-- | library/core/src/fmt/mod.rs | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/library/core/src/fmt/mod.rs b/library/core/src/fmt/mod.rs index 45c2b6a6a0f..8fc43cb1875 100644 --- a/library/core/src/fmt/mod.rs +++ b/library/core/src/fmt/mod.rs @@ -975,9 +975,17 @@ pub trait UpperHex { /// `p` formatting. /// /// The `Pointer` trait should format its output as a memory location. This is commonly presented -/// as hexadecimal. +/// as hexadecimal. For more information on formatters, see [the module-level documentation][module]. /// -/// For more information on formatters, see [the module-level documentation][module]. +/// Printing of pointers is not a reliable way to discover how Rust programs are implemented. +/// The act of reading an address changes the program itself, and may change how the data is represented +/// in memory, and may affect which optimizations are applied to the code. +/// +/// The printed pointer values are not guaranteed to be stable nor unique identifiers of objects. +/// Rust allows moving values to different memory locations, and may reuse the same memory locations +/// for different purposes. +/// +/// There is no guarantee that the printed value can be converted back to a pointer. /// /// [module]: ../../std/fmt/index.html /// |