Florian Ragwitz pushed to branch wip/rafl/hpc-instances at Glasgow Haskell Compiler / GHC Commits: 989054b8 by Florian Ragwitz at 2026-09-04T12:52:35-07:00 Add a changelog entry for new HPC features - - - - - 1 changed file: - + changelog.d/hpc-classinsts Changes: ===================================== changelog.d/hpc-classinsts ===================================== @@ -0,0 +1,23 @@ +section: compiler +synopsis: Improve coverage reporting for class instances and their methods +description: + + Coverage reporting (:ghc-flag:`-fhpc`) now treats class instances more + naturally. + + Compiler-generated instance methods, such as inherited default methods, no + longer receive separate top-level coverage boxes. Explicitly implemented + instance methods retain their own declaration coverage. + + This means that it is no longer necessary to exercise all of a class' methods + in order for it to appear "covered". + + Additionally, top-level coverage boxes are now created for all instances of + classes with methods, and ticked by the use of *any* of the class' methods. + This indicates that an instance was in fact used at run-time. + + Note that classes without any instance methods are currently excluded from + this, and won't have any coverage boxes created. + +mrs: !16632 +issues: #17155 View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/989054b8d826df2810e115378b3f0b0a... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/989054b8d826df2810e115378b3f0b0a... You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help