Doc/Attribute range mapping is broken with inner file docs + outer impl docs #8847
Description
Pasting the following snippet in a file causes the highlighting to break
//! This is a module to test doc injection.
//! ```
//! fn test() {}
//! ```
/// This is an impl with a code block.
///
/// ```
/// fn foo() {
///
/// }
/// ```
impl () {}
This only seems to happen for when the annotated item is an impl, another requirement is that number of lines of doc comments on the impl have to be at least 3 more than the inner doc comments. This also breaks hovering on intra doc links so this seems to be a problem with the source mapping?
This impl stuff seems so oddly specific ...