Update 'or_fun_call' to ignore calls to len

[jeremystucki]

Resolves #1653

changelog: Update or_fun_call: Allow calls to len for Slice, Array & Vec.

[flip1995]

I'm not sure if this is really a FP, since the lint description matches the behavior 100%. with *_or the len() method is called every time, while with *_or_else the len() function is only called in the None/Err case. So even when it's just "a simple value copy", it has to be done, which still can result is perf difference (maybe?).

[flip1995]

@bors r+

Thanks. Contrarily to my previous point, I now see that this is a clear improvement to the lint.

[bors]

📌 Commit d9b8508 has been approved by flip1995

[bors]

⌛ Testing commit d9b8508 with merge f7c486c...

[bors]

💔 Test failed - checks-action_test

[flip1995]

@jeremystucki Can you update this PR to the latest rustc, so we can merge this?

[flip1995]

tests/ui/update-references.sh 'target/debug/test_build_base' 'or_fun_call.rs'

Please rebase this branch, to get rid of the merge commits.

[flip1995]

Thanks!

@bors r+

[bors]

📌 Commit d9f5532 has been approved by flip1995

[bors]

⌛ Testing commit d9f5532 with merge dd06d29...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: flip1995
Pushing dd06d29 to master...