#10196: Regression regarding Unicode subscript characters in identifiers -------------------------------------+------------------------------------- Reporter: thomie | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.2 Component: Compiler | Version: 7.10.1 (Parser) | Keywords: Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: GHC rejects | Test Case: valid program | Blocking: Blocked By: | Differential Revisions: Related Tickets: #5108 | -------------------------------------+------------------------------------- Old description:
As reported by both hvr as user Yongqian Li:
The Unicode7 update in GHC 7.10 had the side effect of breaking code making use of subscript symbols that did compile with GHC 7.8.4, but won't anymore with GHC 7.10.1:
For instance, GHCi 7.8.4 accepts
let xᵦ = 1 let xᵤ = 1 let xᵩ = 1 let xᵢ = 1 let xᵪ = 1 let xᵣ = 1 let xₙ = 1
whereas GHC 7.10.1RC fails parsing those with a lexical error. (NB: GHC 7.8 does not accept *all* latin subscript letters either).
New description: As reported by both hvr as user Yongqian Li: The [changeset:d4fd16801bc59034abdc6214e60fcce2b21af9c8 Unicode 7.0 update] in GHC 7.10 had the side effect of breaking code making use of subscript symbols that did compile with GHC 7.8.4, but won't anymore with GHC 7.10.1: For instance, GHCi 7.8.4 accepts {{{#!hs let xᵦ = 1 let xᵤ = 1 let xᵩ = 1 let xᵢ = 1 let xᵪ = 1 let xᵣ = 1 let xₙ = 1 }}} whereas GHC 7.10.1RC fails parsing those with a lexical error. (NB: GHC 7.8 does not accept ''all'' latin subscript letters either). -- Comment (by hvr): Minor markup improvement in ticket-description -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10196#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler