rustfmt misformat when comment blocks are used

[knoxfighter]

misformat if two consecutive lines start with /* and the first line only contains comments and no actual code.

rustfmt doesn't correctly parse the end (*/) of /* code blocks. I use a code block to better see the offsets of each field of a type. Unfortunately this causes the second line /* to be changed to just * as if it is a continued comment line.
It only happens if the line starts with /* and has only comments in this line.

.rustfmt.toml:

wrap_comments = true

Input:

pub struct Type {
    /* 0x34 */ // _buf2: Buf<0x4>, // padding
    /* 0x4C */ pub field: u32,
}

Output:

pub struct Type {
    /* 0x34 */ // _buf2: Buf<0x4>, // padding
     * 0x4C */ pub field: u32,
}

[ytmimi]

This seems related to #4421, which was originally triggered by format_code_in_doc_comments=true. I checked and #4421 also seems to be triggered by wrap_comments=true, though the original issue has been resolved.