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     Template Haskell: dynamically scoped qualified names
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This commit adds a constructor to TH.Name, so that

	nameBase (mkName "Foo.baz")    == "baz"
	nameModule (MkName "Foo.baz") == "Foo"

We always did parse the module name off the front, but it used to
be done in hsSyn/Convert, but now it's done in TH.Syntax, which is
a better place.