build(deps): bump golang.org/x/tools from 0.0.0-20210106214847-113979e3529a to 0.15.0

[dependabot]

Bumps golang.org/x/tools from 0.0.0-20210106214847-113979e3529a to 0.15.0.

Release notes

Sourced from golang.org/x/tools's releases.

gopls/v0.14.1

This release contains just two changes:

• A workaround for a regression affecting some users of GOPACKAGESDRIVER: golang/go#63751, for example those using gopls with an older version of Bazel. When the go/packages driver is missing compiler or architecture information, gopls now assumes a default value rather than failing to load package information.
• A fix for a minor bug in the new "remove unused parameter" refactoring: golang/go#63755. Notably, this bug was discovered via an automated report from someone who had opted in to Go telemetry.

gopls/v0.14.0

These are release notes are identical to the v0.14.0-pre.4 prerelease notes. Thanks to all who tested the prerelease!

go install golang.org/x/tools/gopls@v0.14.0

This release includes initial support for the "inline call to function" refactoring, as well as a few other smaller features. It also includes several bug fixes, notably a fix for a performance regression in completion that may be significant in some environments.

The release also contains support for opt-in telemetry. If you want, you can enable the periodic uploading of telemetry data, including gopls stack traces and metrics, but never your source code, to telemetry.go.dev. See below for details.

New Features

Refactoring: inline call to function

This release includes a new code action to inline function calls:

While the outcome of this operation may be a simple replacement, there's a lot going on under the covers. For example, the new inliner checks whether changes to the order of argument evaluation could have unintended consequences. If so, it is careful to replicate the original behavior:

add preserves the order of effects	...but sub does not

The goal of the inliner is to rewrite your code idiomatically without introducing behavior changes. See the inlining documentation for more details.

When the call cannot be reduced to a simple expression, the inliner may fall back on an immediately invoked function literal (func() { statements }()) as this is often the only way to preserve the original behavior. As we continue to work on refactoring, we'll add additional rewriting strategies that avoid this fall-back in more cases.

Refactoring: removing unused parameters

The techniques described in the previous section serve as a foundation for other refactoring operations. As a proof of concept, this release also includes a code action to remove unused parameters. Since this operation uses inlining behind the scenes, it gets all of the related safety checks and rewriting strategies for free:

Improved support for go:embed directives

This release includes improved support for //go:embed directives, including hover and jump-to-definition.

New analyses

This release include three new static analyses, all of which are enabled by default.

... (truncated)

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