refutable let bindings produce "irrefutable pattern failed" errors

In ghc-8.2.2 (probably since ghc-8.0.1), strict pattern matches in let bindings produce "Irrefutable pattern failed" errors.

GHCi, version 8.2.2: http://www.haskell.org/ghc/  :? for help
Prelude> :set -XBangPatterns 
Prelude> let ![] = [1] in 1
*** Exception: <interactive>:2:5-13: Irrefutable pattern failed for pattern []

In ghc-7.10.2, normal pattern match failures were produced.

GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
Prelude> :set -XBangPatterns 
Prelude> let ![] = [1] in 1
*** Exception: <interactive>:3:5-13: Non-exhaustive patterns in pattern binding

To my mind, the latter error makes much more sense; the effect of the ! is to make the pattern an ordinary, refutable one. Could the old behavior be restored?

Trac metadata

Trac field	Value
Version	8.2.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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