added collision check for '_this' #155
Merged
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Deciding if
_this
in user code collides with_this
that will be introduced in generated code required knowledge about arrow function that potentially reside in parts of the AST that are not yet examined. To avoid multiple tree traversals if node named_this
is found - we put it in the list of candidates and process items from this list after checking of all elements in file is finished - at this moment value ofNodeCheckFlags.CaptureThis
is already set for all places that capture lexical this so collision check is relatively cheap.This fixes #64