Parser should suggest -XMagicHash

When using GHCi, this is leading to a weird situation where GHCi is actually suggesting an identifier with # in it, but also rejecting when you actually type it:

➜  ~  ghc-stage2 --interactive
GHCi, version 7.11.20151016: http://www.haskell.org/ghc/  :? for help
λ:1> :m + GHC.Prim
λ:2> :t unsafe
unsafeCoerce#            unsafeFreezeArrayArray#  unsafeFreezeSmallArray#  unsafeThawSmallArray#
unsafeFreezeArray#       unsafeFreezeByteArray#   unsafeThawArray#
λ:2> :t unsafeCoerce# 

<interactive>:1:14: error:
    parse error (possibly incorrect indentation or mismatched brackets)
λ:3> :set -XMagicHash
λ:4> :t unsafeCoerce#
unsafeCoerce# :: a -> b

(also tried with 7.10)

Trac metadata

Trac field	Value
Version	7.10.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	low
Resolution	Unresolved
Component	Compiler
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