rails gotchas: assert_raises a syntax error

I found that assert_raise was causing a syntax error of the form:
syntax error, unexpected '{', expecting kEND (SyntaxError)
For a fairly simple test:

should "remove it from the database" do
  assert_raise ActiveRecord::RecordNotFound { User.find(@uid)}
end

Looks like it's getting confused about nesting. the solution? parenthesise your Error thus:

should "remove it from the database" do
  assert_raise(ActiveRecord::RecordNotFound) { User.find(@uid)}
end