#15367: Misleading error message when unboxed tuples used in sums without -XUnboxedTuples -------------------------------------+------------------------------------- Reporter: osa1 | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #15073 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * status: new => closed * resolution: => duplicate * related: => #15073 Comment: This is an (indirect) duplicate of #15073, which has been fixed in GHC 8.6.1. In GHC 8.6.1, your program does indeed suggest enabling `UnboxedTuples`: {{{ $ /opt/ghc/8.6.1/bin/ghc Bug.hs [1 of 1] Compiling Lib ( Bug.hs, Bug.o ) Bug.hs:5:1: error: • Illegal unboxed tuple type as function argument: (# Int, Int #) Perhaps you intended to use UnboxedTuples • In the type synonym declaration for ‘Foo’ | 5 | type Foo = (# (# Int, Int #) | Int #) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15367#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler