Commits on Jan 5, 2020

1. Handle multiple error fix suggestions carefuly …

   The existing code seems to assume that substitutions spans are disjoint,
   which is not always the case.
   
   In the example:
   
       pub trait AAAA {}
       pub trait B {}
       pub trait C {}
       pub type T<P: AAAA + B + C> = P;
   
   , we get three substituions starting from ':' and ending respectively at
   the end of each trait token.
   
   With the former offset calculation, this would cause `underline_start` to
   eventually become negative before being converted to `usize`...
   
   The new version may report erroneous results for non perfectly overlapping
   substitutions but I don't know if such examples exist. Alternatively, we
   could detect these cases and trim out overlapping substitutions.

   

   lbonn committed Jan 5, 2020
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