#15559: fromJust has no HasCallStack -------------------------------------+------------------------------------- Reporter: nomeata | Owner: (none) Type: feature request | Status: patch Priority: normal | Milestone: 8.6.1 Component: Core Libraries | Version: 8.4.3 Resolution: | Keywords: newcomer Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D5256 Wiki Page: | -------------------------------------+------------------------------------- Comment (by Ben Gamari <ben@…>): In [changeset:"614028e3b02a5b71a9fbf9c7028f270760ccdab2/ghc" 614028e/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="614028e3b02a5b71a9fbf9c7028f270760ccdab2" Data.Maybe: add callstack for fromJust (Trac #15559) Per feature request, add `HasCallStack` to `fromJust` in `Data.Maybe` and use `error` instead of `errorWithoutStackTrace`. This allows `fromJust` to print call stacks when throwing the error. Also add a new test case for the behaviour, modify existing test cases for new signature Test Plan: New test cases Reviewers: hvr, bgamari Reviewed By: bgamari Subscribers: ulysses4ever, rwbarton, carter GHC Trac Issues: #15559 Differential Revision: https://phabricator.haskell.org/D5256 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15559#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler