#10735: Smooth out the differences between `compiler/utils/Pretty.hs` and `libraries/pretty` -------------------------------------+------------------------------------- Reporter: thomie | Owner: thomie Type: task | Status: patch Priority: normal | Milestone: 7.12.1 Component: Compiler | Version: 7.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #1062, #1176, | Differential Revisions: #7666, #8809 | Phab:D1130, Phab:D1132 -------------------------------------+------------------------------------- Comment (by Thomas Miedema <thomasmiedema@…>): In [changeset:"67576ddc67f39bef43c473f30af0887d22011710/ghc" 67576ddc/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="67576ddc67f39bef43c473f30af0887d22011710" Pretty: bugfix fillNB (#10735) This is a backport of a bug fix by Benedikt Huber (#2393), from commit 1e50748beaa4bd2281d323b18ea51c786bba04a1 in the pretty library. From https://mail.haskell.org/pipermail/libraries/2008-June/009991.html: Law <l1> states that > sep (ps++[empty]++qs) = sep (ps ++ qs) > ...ditto hsep, hcat, vcat, fill... In the current implementation, this fails for the paragraph fill variants. > render' $ fsep [ text "c", text "c",empty, text "c", text "b"] > where render' = renderStyle (Style PageMode 7 1.4) >> c c c >> b }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10735#comment:15> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler