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[`useless_vec`]: add more tests and don't lint inside of macros Closes #11084. I realized that the fix I added in #11081 itself also causes an error in a suggestion when inside of a macro. Example: ```rs macro_rules! x { () => { for _ in vec![1, 2] {} } } x!(); ``` Here it would suggest replacing `vec![1, 2]` with `[x!()]`, because that's what the source callsite is (reminder: it does this to get the correct span of `x!()` for code like `for _ in vec![x!()]`), but that's wrong when *inside* macros, so I decided to make it not lint if the whole loop construct is inside a macro to avoid this issue. changelog: [`useless_vec`]: add more tests and don't lint inside of macros r? `@Alexendoo` since these were your tests, I figured it makes most sense to assign you