GHC 8.0.2 panics when trying a simple snippet involving Parsec

I am working through "Create your own Scheme in 48 hours", and the following program:

$ cat SimpleParser.hs
import Text.ParserCombinators.Parsec hiding (spaces)

symbol :: Parser Char
symbol = anyOf "!$%&|*+-/:<=?>@^_^~#"

causes GHC to crash and burn with a panic message.

Please find the details as follows:

• * PLATFORM and OS DETAILS **

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.12.2
BuildVersion:	16C67

$ uname -a
Darwin <elided> 16.3.0 Darwin Kernel Version 16.3.0: Thu Nov 17 20:23:58 PST 2016; root:xnu-3789.31.2~1/RELEASE_X86_64 x86_64

• * GHC and Parsec version**

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.0.2

$ ghc-pkg list | grep -i parsec
    attoparsec-0.13.1.0
    parsec-3.1.11

• * crash error message **

$ ghc -v3 SimpleParser.hs
Glasgow Haskell Compiler, Version 8.0.2, stage 2 booted by GHC version 7.10.3
Using binary package database: /Library/Frameworks/GHC.framework/Versions/8.0.2-x86_64/usr/lib/ghc-8.0.2/package.conf.d/package.cache
Using binary package database: /Users/<elided>/.ghc/x86_64-darwin-8.0.2/package.conf.d/package.cache
loading package database /Library/Frameworks/GHC.framework/Versions/8.0.2-x86_64/usr/lib/ghc-8.0.2/package.conf.d
loading package database /Users/<elided>/.ghc/x86_64-darwin-8.0.2/package.conf.d
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0
wired-in package integer-gmp mapped to integer-gmp-1.0.0.1
wired-in package base mapped to base-4.9.1.0
wired-in package rts mapped to rts
wired-in package template-haskell mapped to template-haskell-2.11.1.0
wired-in package ghc mapped to ghc-8.0.2
wired-in package dph-seq not found.
wired-in package dph-par not found.
Hsc static flags:
loading package database /Library/Frameworks/GHC.framework/Versions/8.0.2-x86_64/usr/lib/ghc-8.0.2/package.conf.d
loading package database /Users/z0ltan/.ghc/x86_64-darwin-8.0.2/package.conf.d
wired-in package ghc-prim mapped to ghc-prim-0.5.0.0
wired-in package integer-gmp mapped to integer-gmp-1.0.0.1
wired-in package base mapped to base-4.9.1.0
wired-in package rts mapped to rts-1.0
wired-in package template-haskell mapped to template-haskell-2.11.1.0
wired-in package ghc mapped to ghc-8.0.2
wired-in package dph-seq not found.
wired-in package dph-par not found.
*** Chasing dependencies:
Chasing modules from: *SimpleParser.hs
!!! Chasing dependencies: finished in 0.62 milliseconds, allocated 0.337 megabytes
Stable obj: []
Stable BCO: []
Ready for upsweep
  [NONREC
      ModSummary {
         ms_hs_date = 2017-06-28 09:58:23 UTC
         ms_mod = Main,
         ms_textual_imps = [(Nothing, Prelude),
                            (Nothing, Text.ParserCombinators.Parsec)]
         ms_srcimps = []
      }]
*** Deleting temp files:
Deleting:
compile: input file SimpleParser.hs
*** Checking old interface for Main:
[1 of 1] Compiling Main             ( SimpleParser.hs, SimpleParser.o )
*** Parser [Main]:
!!! Parser [Main]: finished in 0.20 milliseconds, allocated 0.134 megabytes
*** Renamer/typechecker [Main]:
*** Deleting temp files:
Deleting:
*** Deleting temp dirs:
Deleting:
ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-apple-darwin):
	initTc: unsolved constraints
  WC {wc_insol = [W] anyOf_a1lw :: t_a1lv[tau:1] (CHoleCan: anyOf)}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Trac metadata

Trac field	Value
Version	8.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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