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better support for `_` identifier

* disallow variable declaration of `_`
 * prevent `_` from shadowing itself
 * prevent read access of `_`

closes #1204
closes #1320
298abbcff8kristopher tate committed on 8/3/2018, 6:57:17 AM· committed by Andrew Kelleyparentfb05b96
4 files changedLine totals unavailable