#15326: Add option to disable error message expression context (the 'In the expression' things) -------------------------------------+------------------------------------- Reporter: dramforever | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- A typical error looks like this: {{{ bug.hs:17:7: warning: [-Wdeferred-type-errors] ? No instance for (PolyList t0 [Integer]) arising from a use of ‘polyList’ ? In the expression: polyList 1 2 3 4 5 In an equation for ‘plh’: plh = polyList 1 2 3 4 5 | 17 | plh = polyList 1 2 3 4 5 | ^^^^^^^^^^^^^^^^^^ }}} Note the two lines starting with `In`. They waste two lines of error message space and now provides near zero utility since: 1. There's a caret view right below that context. 2. There are editor integrations that show squiggles right in the editor. Now we have an option `-f[no-]diagnostics-show-caret` that disables the caret. It would be great to have one that disables those code context lines too. As for naming. I'm thinking about `-f[no-]diagnostics-show-context`, which may be confused with constraint contexts, and `-f[no-]diagnostics-show- code-context`, which is a bit too long. I don't really know what those context lines are properly called, so maybe someone can come up with a more precise one. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15326 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler