#9049: Expose srcLoc from the assertion architecture to allow better error messages -------------------------------------+------------------------------------- Reporter: nh2 | Owner: gridaphobe Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.2 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by gridaphobe): One use-case that the implicit parameters approach supports that neither -prof nor -g really do is reifying the source locations to a data structure that your haskell program can process. I imagine this is a fairly niche scenario, but it's extremely useful for embedded DSLs. I was recently working on tooling support for an EDSL used to write large (10+ kloc) programs, and providing useful diagnostic messages for the DSL was quite difficult, because I only had access to the internal AST, nothing remained of the original haskell program. I ended up writing a Core-to- Core plugin to insert the source locations that I mined from -prof, but it's a bit kludgy. This approach, on the other hand, makes it trivial for a function to get a hold of its call-site. Perhaps it would make sense to discuss the implications of this feature for library authors on the core-libraries list? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9049#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler