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Rust 1.32 Improves Tracing, Modules, Macros, and More

https://www.infoq.com/news/2019/01/rust-1.32-released
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Jan 23, 2019 9:00 AM 2+ mon ago

Rust 1.32 Improves Tracing, Modules, Macros, and More

Rust 1.32 includes a number of new language features meant to improve developer experience when tracing the execution of programs for debugging purposes. Additionally, Rust now uses the system allocator by default for memory allocation, and this release also completes work on the module system which make it easier to use, and more.

The new dbg! macro greatly streamlines the task of printing out debug information. For example, if you want to print the value of a variable x, you can now just use dbg!(x); instead of the cumbersome println!("{:#?}", x);. As a bonus, dbg! will also automatically print file and line number and the name of the variable being dumped. Another great feature of dbg! is it is a function that returns the value being printed out, which enables its use within expressions, like in the following case:

The ...

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Rust 1.31 Brings the First Rust 2018 Features, Non-lexical Lifetimes and Module Improvements

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