Auto merge of #12005 - PartiallyTyped:11713, r=blyxyas

`unused_io_amount` captures `Ok(_)`s

Partial rewrite of `unused_io_amount` to lint over `Ok(_)` and `Ok(..)`.

Moved the check to `check_block` to simplify context checking for expressions and allow us to check only some expressions.

For match (expr, arms) we emit a lint for io ops used on `expr` when an arm is `Ok(_)|Ok(..)`. Also considers the cases when there are guards in the arms and `if let Ok(_) = ...` cases.

For `Ok(_)` and `Ok(..)` it emits a note indicating where the value is ignored.

changelog: False Negatives [`unused_io_amount`]: Extended `unused_io_amount` to catch `Ok(_)`s in `If let` and match exprs.

Closes #11713

r? `@giraffate`

0 files changed, 0 insertions, 0 deletions