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2017-03-05improve `unsafe` on undefined (#1548)Alex Lam S.L
`unsafe` turns undefined keyword into a variable of the same name if found, but that interferes with other related optimisations. Keep track of such transformations to ensure zero information loss in the process.
2017-02-18fix crash in unsafe replacement of undefinedalexlamsl
remove extraneous call to AST_SymbolRef.reference() closes #1443