Update golang.org/x/tools

Update golang.org/x/tools and some other minor changes.

New Contributors

• @sashamelentyev made their first contribution in #17
• @clfs made their first contribution in #22

Thanks!

Full Changelog: v0.4.2...v0.4.3

Multi-package targets, more constructors found

What's Changed

• 'fzgen ./...' now works, placing output files in directory of target packages #11
• A wider set of candidate constructors are examined by default #16
  • Previously, the regexp '^New' was the default, but now '.' is the default -ctor regexp
  • Hopefully the -ctor flag is now less commonly used
• Multiple chains for a single package are now created #12
• Bug fixes that enable more targets to work by default #9
• Performance improvements
• Other smaller improvements, such as better messages explaining why a target package was skipped, and better emitted comments.

Thanks especially to @josharian (Tailscale) for the helpful bug reports!

Full v0.4.2 Changelog: v0.4.1...v0.4.2

Please see the v0.4.0 release notes for larger recent updates.

Replace emitted nil checks for user arguments

This release includes:

• Replace emitted nil checks for user arguments with fuzzer.Chain checks at execution time.

Please see the v0.4.0 release for larger recent updates (https://github.com/thepudds/fzgen/releases/tag/v0.4.0).

New repo, support cmd/go 1.18 fuzzing

This release includes:

• Rename to fzgen (from older https://github.com/thepudds/fzgo), with new repo.
• Support cmd/go 1.18 fuzzing.
• Better runtime chaining of function calls under test. (See README).
• Option to emit valid Go code for standalone crash reproducers (via FZDEBUG=repro=1).
• Automatic roundtrip tests for targets that implement encoding.BinaryMarshaler/TextMarshaler interfaces.
• Better corpus encoding.
• Updated README.
• An intention to bring to 1.0.0 quality.