  --> [ local path prefix ]/event/not_displayable.fpp:15:14
   |
15 |   event E(x: T) severity activity low format "{}"
   |              ^ type of event is not displayable
   |
  ::: [ local path prefix ]/event/not_displayable.fpp:7:1
   |
 7 | type T
   | ------ type is defined here

