compile-mode integration: add link to code references. (#391)
This allows to jump to code references such as lines 82 and 132 in the
following snippet error message.
error[E0061]: this function takes 1 parameter but 2 parameters were supplied
--> file6.rs:132:34
|
82 | fn duration_ms_since(time: &Option<SystemTime>) -> u128 {
| ------------------------------------------------------- defined here
...
132 | self.total_time_ms = duration_ms_since(&self.program_start, 2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^