Version 1.49.0 (2020-12-31)

Language

Compiler

* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support.

Libraries

Stabilized APIs

The following previously stable methods are now const.

Cargo

Compatibility Notes

Internal Only

These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools.