INLINEing top-level patterns causes ghc to emit 'arity missing' traces
When an INLINE pragma is specified on a pattern, ghc-7.6.1 shows some internal trace messages.
module Foo where
{-# INLINE widths #-}
widths :: [Int]
widthMonth, widthYear :: Int
widths@[widthMonth, widthYear] = [1,2]
~/Downloads$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.6.1
~/Downloads$ ghc Foo.hs -O
[1 of 1] Compiling Foo ( Foo.hs, Foo.o )
makeCorePair: arity missing widths{v aeJ} [lid]
I'm not certain that specifying an INLINE pragma in this context even makes sense, in which case perhaps a more useful warning could be produced.
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | jwlato@gmail.com |
Operating system | |
Architecture |