Chapter 4. Changes in Rust Toolset in Red Hat Developer Tools 2018.1

This chapter lists some notable changes in Rust Toolset since its previous release.

4.1. Rust
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Rust has been updated from version 1.20.0 to 1.22.1. Notable changes include:

The Option type implements the Try trait for the ? operator.
Assignment operations have been implemented for references on the right hand side of assignment:
```
x = &1; y += x;
```
```
x = &1; y += x;
```
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Types implementing the Drop trait can be const or static.
Static references to literals are allowed.
Arrays and tuples of Clone types implement the Clone trait themselves.
Tag values of enumerations can be read with the std::mem::discriminant() function.
The Iterator::for_each() function has been added to apply a function to all items of an iterator.
Functions min() and max() have been added to the Ord trait.
The default amount of code generation units for debug builds has been changed to 16.

The cargo tool has been updated from version 0.21.1 to 0.23.0. Notable changes include:

Support for specifying multiple crates at once has been added to the cargo install command.
Support for enhanced patterns has been added to the include and exclude fields of Cargo.toml project manifest files.
Support for overriding parts of the crate dependency graph with the [patch] section of Cargo.toml files has been added.
Support for using dependencies vendored from git repositories has been added.

The cargo-vendor plugin has been updated from version 0.1.12 to 0.1.13. Notable changes include:

An option --disallow-duplicates has been added to prevent duplication of vendored dependencies.
Error messages are printed to the standard error output (stderr).
Note that this allows redirecting the output of the cargo vendor command into a file for direct use.