Change:
<ins> [0m[1m[38;5;9merror[E0106][0m[0m[1m: missing lifetime specifier[0m [0m  [0m[0m[1m[38;5;12m--> [0m[0m$DIR/multiline-multipart-suggestion.rs:4:34[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m|[0m[0m [0m[0mfn short(foo_bar: &Vec<&i32>) -> &i32 { [0m   [0m[0m[1m[38;5;12m| [0m[0m                  [0m[0m[1m[38;5;12m----------[0m[0m     [0m[0m[1m[38;5;9m^[0m[0m [0m[0m[1m[38;5;9mexpected named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m   [0m[0m[1m[38;5;12m= [0m[0m[1mhelp[0m[0m: this function's return type contains a borrowed value, but the signature does not say which one of `foo_bar`'s 2 lifetimes it is borrowed from[0m [0m[1m[38;5;14mhelp[0m[0m: consider introducing a named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m| [0m[0mfn short[0m[0m[38;5;10m<'a>[0m[0m(foo_bar: &[0m[0m[38;5;10m'a [0m[0mVec<&[0m[0m[38;5;10m'a [0m[0mi32>) -> &[0m[0m[38;5;10m'a [0m[0mi32 { [0m   [0m[0m[1m[38;5;12m|[0m[0m         [0m[0m[38;5;10m++++[0m[0m           [0m[0m[38;5;10m++[0m[0m      [0m[0m[38;5;10m++[0m[0m           [0m[0m[38;5;10m++[0m [0m[1m[38;5;9merror[E0106][0m[0m[1m: missing lifetime specifier[0m [0m  [0m[0m[1m[38;5;12m--> [0m[0m$DIR/multiline-multipart-suggestion.rs:11:6[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m|[0m[0m [0m[0m    foo_bar: &Vec<&i32>,[0m [0m   [0m[0m[1m[38;5;12m| [0m[0m             [0m[0m[1m[38;5;12m----------[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m|[0m[0m [0m[0m    something_very_long_so_that_the_line_will_wrap_around__________: i32,[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m|[0m[0m [0m[0m) -> &i32 {[0m [0m   [0m[0m[1m[38;5;12m| [0m[0m     [0m[0m[1m[38;5;9m^[0m[0m [0m[0m[1m[38;5;9mexpected named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m   [0m[0m[1m[38;5;12m= [0m[0m[1mhelp[0m[0m: this function's return type contains a borrowed value, but the signature does not say which one of `foo_bar`'s 2 lifetimes it is borrowed from[0m [0m[1m[38;5;14mhelp[0m[0m: consider introducing a named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[38;5;10m~ [0m[0mfn long[0m[0m[38;5;10m<'a>[0m[0m( [0m[1m[38;5;12mLL[0m[0m [0m[0m[38;5;10m~ [0m[0m    foo_bar: &[0m[0m[38;5;10m'a [0m[0mVec<&[0m[0m[38;5;10m'a [0m[0mi32>,[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m| [0m[0m    something_very_long_so_that_the_line_will_wrap_around__________: i32,[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[38;5;10m~ [0m[0m) -> &[0m[0m[38;5;10m'a [0m[0mi32 {[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;9merror[E0106][0m[0m[1m: missing lifetime specifier[0m [0m  [0m[0m[1m[38;5;12m--> [0m[0m$DIR/multiline-multipart-suggestion.rs:16:29[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[1m[38;5;12m|[0m[0m [0m[0m    foo_bar: &Vec<&i32>) -> &i32 {[0m [0m   [0m[0m[1m[38;5;12m| [0m[0m             [0m[0m[1m[38;5;12m----------[0m[0m     [0m[0m[1m[38;5;9m^[0m[0m [0m[0m[1m[38;5;9mexpected named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m   [0m[0m[1m[38;5;12m= [0m[0m[1mhelp[0m[0m: this function's return type contains a borrowed value, but the signature does not say which one of `foo_bar`'s 2 lifetimes it is borrowed from[0m [0m[1m[38;5;14mhelp[0m[0m: consider introducing a named lifetime parameter[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;12mLL[0m[0m [0m[0m[38;5;10m~ [0m[0mfn long2[0m[0m[38;5;10m<'a>[0m[0m( [0m[1m[38;5;12mLL[0m[0m [0m[0m[38;5;10m~ [0m[0m    foo_bar: &[0m[0m[38;5;10m'a [0m[0mVec<&[0m[0m[38;5;10m'a [0m[0mi32>) -> &[0m[0m[38;5;10m'a [0m[0mi32 {[0m [0m   [0m[0m[1m[38;5;12m|[0m [0m[1m[38;5;9merror[0m[0m[1m: aborting due to 3 previous errors[0m [0m[1mFor more information about this error, try `rustc --explain E0106`.[0m </ins>

Discussion:
The bug is in the help section of the "missing lifetime specifier" error (E0106). When the method head is formatted over multiple lines, then green highlighting will be misaligned. I tried this code: I expected to see this happen: For the function it looks like this, which is fine <img width="417" alt="image" src="https://user-"Instead, this happened: But for the function the highlight is misaligned <img width="564" alt="image" src="https://user-"<!-- If you're using the stable version of the compiler, you should also check if the bug also exists in the beta or nightly versions. --: also on stable: <!-- Include a backtrace in the code block by setting in your environment. E.g. . --<details<summaryBacktrace</summary<p</p</details