New Lint: disallowed_method

[ilknarf]

Fixes #6073

I added a disallowed_method lint that works similar to blacklisted_name, e.g allows config-defined disallowed method calls.

This lint allows advanced users to patch in undesired method calls for specific projects. It basically uses the DefId of method calls and matches it to parsed strings. Is there an alternative approach that could use more easily digestible configuration strings?

All tests pass as expected except for a linting error on ui/redundant_pattern_matching_option, which I am not sure how to resolve since I don't think I changed anything affecting it.

changelog: Add disallowed_method lint to warn on user-defined method calls

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @matthiaskrgr (or someone else) soon.

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[matthiaskrgr]

Hi, thanks for the patch!
Some notes:

If you add "Fixes #6073" to pr description, the linked ticket will auto-close once the pr is merged.

The "changelog: none" line at bottom will later be used to auto-generate a changelog for clippy.
It should read something like "changelog: Add disallowed_method lint to warn on user-defined method calls" or something like that. :)

We try to keep merge commits to a minimum which is why we rebase branches instead of merging master into them.

[ilknarf]

Sorry for the force push, is it OK that I removed the useless tests since I removed the default values?

[ilknarf]

The issues should be resolved

[matthiaskrgr]

LGTM!

[matthiaskrgr]

Thanks!
@bors r+

[bors]

📌 Commit 5f7b643 has been approved by matthiaskrgr

[bors]

⌛ Testing commit 5f7b643 with merge ea079eb...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: matthiaskrgr
Pushing ea079eb to master...