#11303: Pattern matching against sets of strings sharing a prefix blows up pattern checker -------------------------------------+------------------------------------- Reporter: bgamari | Owner: gkaracha Type: bug | Status: new Priority: highest | Milestone: 8.0.1 Component: Compiler | Version: 7.11 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #11302 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Another place "in the wild" where this appears to occur is `text-icu`. Attempting to compile `Data.Text.ICU.Regex.Internal` very quickly eats up all of my RAM. I tried waiting for about half an hour for it to finish before giving up (then again, I was using a laptop with "only" 4 GB of RAM). If pattern matching is the culprit, then [https://github.com/bos /text- icu/blob/bfe19b0b4214a586ebcaecc33d460e679a5133f6/Data/Text/ICU/Regex/Internal.hsc#L177 toURegexOpts] is the probable scene of the crime. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11303#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler