nl_tokens: Return true if the given type is part of a deeply nested chain of generic instantiations . We consider this to be the case when structural type comparisons have been started for 10 or more instantiations of the same generic type . It is possible though highly unlikely for this test to be true in a situation where a chain of instantiations is not infinitely expanding . Effectively we will generate a false positive when two types are structurally equal to at least 10 levels but unequal at some level beyond that .
pl_tokens: function isDeeplyNestedGeneric ( type , stack , depth ) { // We track type references (created by createTypeReference) and instantiated types (created by instantiateType) if ( type . flags & ( 4096 /* Reference */ | 131072 /* Instantiated */ ) && depth >= 5 ) { var symbol = type . symbol ; var count = 0 ; for ( var i = 0 ; i < depth ; i ++ ) { var t = stack [ i ] ; if ( t . flags & ( 4096 /* Reference */ | 131072 /* Instantiated */ ) && t . symbol === symbol ) { <mask> ++ ; if ( count >= 5 ) return true ; } } } return false ; }