#14588: GHC 8.2.1 allows bang patterns in let-bindings without -XBangPatterns -------------------------------------+------------------------------------- Reporter: kmiyazato | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: GHC accepts Unknown/Multiple | invalid program Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Bang patterns occurring in let-bindings are allowed even if -XBangPatterns extension is not enabled. {{{#!hs -- Compile error in 8.0.2 -- Compiles in 8.2.1 and 8.2.2 main = print (let !x = 1 + 2 in x) }}} {{{#!hs -- Compile error in all of 8.0.2, 8.2.1, and 8.2.2 main = print (let f !x !y = x + y in f 1 2) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14588 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler