Indent return types separated from params by newline #4368
Merged
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#3891 removed Version One formatting that did this correctly (https://github.com/rust-lang/rustfmt/pull/3891/files#diff-5db152a52bdaeae9dacd35f43a4a78ddL2342-L2344),
but at seemingly at the time there were no tests to catch the
regression.
This commit fix-forwards the formatting regression, though via a different
implementation because the original implementation would muddle the branch
for visual indentation and this fix, which is probably not preferrable
giving the existing complexity of the rewrite_required_fn method.
Closes #4366