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Document futility of printing temporary pointers
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@ -975,9 +975,17 @@ pub trait UpperHex {
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/// `p` formatting.
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///
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/// The `Pointer` trait should format its output as a memory location. This is commonly presented
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/// as hexadecimal.
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/// as hexadecimal. For more information on formatters, see [the module-level documentation][module].
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///
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/// For more information on formatters, see [the module-level documentation][module].
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/// Printing of pointers is not a reliable way to discover how Rust programs are implemented.
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/// The act of reading an address changes the program itself, and may change how the data is represented
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/// in memory, and may affect which optimizations are applied to the code.
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///
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/// The printed pointer values are not guaranteed to be stable nor unique identifiers of objects.
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/// Rust allows moving values to different memory locations, and may reuse the same memory locations
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/// for different purposes.
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///
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/// There is no guarantee that the printed value can be converted back to a pointer.
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///
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/// [module]: ../../std/fmt/index.html
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///
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