강동윤 eebf14fbef Allow stable rust (#118) ... This pr introduces some cargo features. For `swc_common` and `swc_ecma_ast`, it introduces a feature flag `fold`. `Fold` and `Visit` traits exist only if the feature is enabled. For `swc_ecma_parser`, flag called `verify` is added. When disabled, we skip checking of validity of some expressions. e.g. `{foo = bar}` Verification is disabled by default it requires nightly compiler		2019-01-17 23:17:16 +09:00
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config	Allow stable rust (#118)	2019-01-17 23:17:16 +09:00