Subteam report: tools 2016-04-08

Highlights

rustup, the successor to multirust, is now available for beta testing. Please feel free to leave feedback on the internals thread!
Nightlies for the i586-pc-windows-msvc target are now being produced.
Nightly for the aarch64-unknown-linux-gnu target are now being produced.
Top level overrides in Cargo have landed, allowing you to specify package overrides in Cargo.toml to work with other collaborators.
The following RFCs have been moved into their final comment period to be decided upon ~2 weeks from now:
- RFC 1510 - Adding a new rdylib crate type. Note that we are specifically interested in hearing about dylib use cases today to see if changing its definition will cause breakage.
- RFC 1525 - Adding workspaces to Cargo
- RFC 1535 - Stabilizing -C overflow-checks as a flag

FCP PR #1510: RFC: Add a new crate-type, rdylib
FCP PR #1525: RFC: Add workspaces to Cargo
FCP PR #1535: Stabilize -C overflow-checks
PR #1133: Make Cargo aware of standard library dependencies
PR #1296: RFC: Add an alias attribute to #[link] and -l
PR #1459: Add a used attribute
PR #1489: Extended static linking
PR #1509: Add space-friendly arguments
PR #1567: Normalization for long error codes explanations RFC
PR #1573: Supporting code generators with source maps and multiple source directories
Issue #635: Use benchmarks to set up a website tracking rust performance
Issue #648: separate rust-format or rustfmt tool that does the pretty-printing
Issue #816: Custom test frameworks
Issue #1061: Rust, Windows, and MSVC